19932: tests/periph: Add test using the Peripheral Selftest Shield r=benpicco a=maribu

### Contribution description

This adds a test that makes use of the peripheral selftesting shield.

#### ToDo

- [x] Add doc

### Testing procedure

- grab an Arduino UNO compatible board that has the Arduino pin map feature
- connect it to the testing shield
- configure the testing shield
    - make sure the VCC selector matches the logic level of the board (3.3V and 5V are the only options)
    - enabled all the "loops" needed for testing on SW1
    - it could be that the UART on D0, D1 is used for stdio. In that case, do *NOT* close the loop
- flash and run the test application

### Issues/PRs references

none

20018: tests/pkg/minmea: fixing RMC timestamp r=benpicco a=jan-mo

The RMC timestamp calculation was creating issues. The timestamp will be related to the EPOCH and time zone. Test on native will fail if the time zone is not set correctly. (see #20005)

# how to test

```
TZ=GMT-1 make test
```
 and 
```
TZ=GMT make test
```
and 
```
TZ=<any> make test
```

`timedatectl  list-timezones` provides you with a List of timzones 

do not fail 

20022: pkg/lwip: add support for slipdev r=benpicco a=benpicco



20025: tests/drivers/at: fix device table overflow r=benpicco a=krzysztof-cabaj

### Contribution description

This PR fix device table overflow in `tests/driver/at`, which could lead to device crash.

### Testing procedure

PR was tested on two nucleo boards with 2 and 3 UARTs (nucleo-l476rg and nucleo-l496zg).
Flash `tests/driver/at` with and without this PR.

Output with this PR:

```
> main(): This is RIOT! (Version: 2022.07-devel-5083-g2b9e8-tests-drivers-at)
AT command test app
> init 5 9600

Wrong UART device number - should by in range 0-2.
>
```

Output without this PR:

```
> main(): This is RIOT! (Version: 2022.07-devel-5083-g2b9e8)
AT command test app
> init 5 9600

8001afd
*** RIOT kernel panic:
FAILED ASSERTION.

*** halted.


Context before hardfault:
   r0: 0x0000000a
   r1: 0x00000000
   . . . 
```

### Issues/PRs references

None

Co-authored-by: Marian Buschsieweke <marian.buschsieweke@posteo.net>
Co-authored-by: Jan Mohr <jan.mohr@ml-pa.com>
Co-authored-by: Benjamin Valentin <benjamin.valentin@ml-pa.com>
Co-authored-by: krzysztof-cabaj <kcabaj@gmail.com>

20022: pkg/lwip: add support for slipdev r=benpicco a=benpicco



20025: tests/drivers/at: fix device table overflow r=benpicco a=krzysztof-cabaj

### Contribution description

This PR fix device table overflow in `tests/driver/at`, which could lead to device crash.

### Testing procedure

PR was tested on two nucleo boards with 2 and 3 UARTs (nucleo-l476rg and nucleo-l496zg).
Flash `tests/driver/at` with and without this PR.

Output with this PR:

```
> main(): This is RIOT! (Version: 2022.07-devel-5083-g2b9e8-tests-drivers-at)
AT command test app
> init 5 9600

Wrong UART device number - should by in range 0-2.
>
```

Output without this PR:

```
> main(): This is RIOT! (Version: 2022.07-devel-5083-g2b9e8)
AT command test app
> init 5 9600

8001afd
*** RIOT kernel panic:
FAILED ASSERTION.

*** halted.


Context before hardfault:
   r0: 0x0000000a
   r1: 0x00000000
   . . . 
```

### Issues/PRs references

None

Co-authored-by: Benjamin Valentin <benjamin.valentin@ml-pa.com>
Co-authored-by: krzysztof-cabaj <kcabaj@gmail.com>

19546: Enable compile_and_test_for_board to skip if nothing changed r=benpicco a=MrKevinWeiss

### Contribution description

The overall goal of this PR is to be able to keep running the `compile_and_test_for_board.py` script without destroying ones boards.  Useful if you are a board owner that wants to keep testing on master (say with nightlies, say in a CI).

For example, I could now just run and rerun the following:
```
./dist/tools/compile_and_test_for_board/compile_and_test_for_board.py . <MY_BOARD> -c
```
and monitor the results, even after updating a branch.

This is because the hashes now get stored with the results (thanks to the `RIOT_TEST_HASH_DIR` var) which means cleaning will not wipe them out.  Specifically in (`<results_base>/<board>/hashes/<app_dir>/test-input-hash.sha1`)

I tried to do as much as I could with make and only alter the python script when needed.

### Testing procedure

Clear results folder and run:
```
./dist/tools/compile_and_test_for_board/compile_and_test_for_board.py . native --applications tests/shell -c
```
<details>

```
INFO:native:Saving toolchain
INFO:native.tests/shell:Board supported: True
INFO:native.tests/shell:Board has enough memory: True
INFO:native.tests/shell:Application has test: True
INFO:native.tests/shell:Run compilation
**INFO:native.tests/shell:Hashes match: False**
INFO:native.tests/shell:Run test
INFO:native.tests/shell:Run test.flash
INFO:native.tests/shell:Success
INFO:native:Tests successful
```
</details>

it should execute the test...

Then the same command again should skip it.
<details>

```
INFO:native:Saving toolchain
INFO:native.tests/shell:Board supported: True
INFO:native.tests/shell:Board has enough memory: True
INFO:native.tests/shell:Application has test: True
INFO:native.tests/shell:Run compilation
**INFO:native.tests/shell:Hashes match: True**
INFO:native.tests/shell:Success
INFO:native:Tests successful
```
</details>

Try changing something (say the `tests/shell/01-run.py`) and rerun, it should trigger the test again.
<details>

```
INFO:native:Saving toolchain
INFO:native.tests/shell:Board supported: True
INFO:native.tests/shell:Board has enough memory: True
INFO:native.tests/shell:Application has test: True
INFO:native.tests/shell:Run compilation
**INFO:native.tests/shell:Hashes match: False**
INFO:native.tests/shell:Run test
INFO:native.tests/shell:Run test.flash
INFO:native.tests/shell:Success
INFO:native:Tests successful
```
</details>

...finally, running without the changes check should run the test as usual, even if nothing changes:
```
./dist/tools/compile_and_test_for_board/compile_and_test_for_board.py . native --applications tests/shell
```
<details>

```
INFO:native:Saving toolchain
INFO:native.tests/shell:Board supported: True
INFO:native.tests/shell:Board has enough memory: True
INFO:native.tests/shell:Application has test: True
INFO:native.tests/shell:Run compilation
INFO:native.tests/shell:Run test
INFO:native.tests/shell:Run test.flash
INFO:native.tests/shell:Success
INFO:native:Tests successful
```
</details>

### Issues/PRs references

Might help the surprises we got with #19469


20022: pkg/lwip: add support for slipdev r=benpicco a=benpicco



20025: tests/drivers/at: fix device table overflow r=benpicco a=krzysztof-cabaj

### Contribution description

This PR fix device table overflow in `tests/driver/at`, which could lead to device crash.

### Testing procedure

PR was tested on two nucleo boards with 2 and 3 UARTs (nucleo-l476rg and nucleo-l496zg).
Flash `tests/driver/at` with and without this PR.

Output with this PR:

```
> main(): This is RIOT! (Version: 2022.07-devel-5083-g2b9e8-tests-drivers-at)
AT command test app
> init 5 9600

Wrong UART device number - should by in range 0-2.
>
```

Output without this PR:

```
> main(): This is RIOT! (Version: 2022.07-devel-5083-g2b9e8)
AT command test app
> init 5 9600

8001afd
*** RIOT kernel panic:
FAILED ASSERTION.

*** halted.


Context before hardfault:
   r0: 0x0000000a
   r1: 0x00000000
   . . . 
```

### Issues/PRs references

None

Co-authored-by: MrKevinWeiss <weiss.kevin604@gmail.com>
Co-authored-by: Benjamin Valentin <benjamin.valentin@ml-pa.com>
Co-authored-by: krzysztof-cabaj <kcabaj@gmail.com>