Prepare for HAL 0.6.0 release (rp-rs#430)

* Prep for HAL 0.6.0 release

* Update changelog, readme and version number for HAL 0.5.0 release
* Bump HAL version in BSP deps
* Add the missing boards to the main README.md

Prep for HAL 0.5.0 release (rp-rs#351)

* Update changelog, readme and version number for HAL 0.5.0 release

* Bump HAL version in BSP deps

* Point ws2812-pio and i2c-pio-rs at hal_0.5.0 branches

* Update changelog with latest commits and release date

Update BSPs prior to release (rp-rs#313)

* Update BSP authors to include 'rp-rs developers'

* Update BSP readme's to reflect current release version

* Update BSP changelogs

* Fix version number in HAL README

Prep for 0.4.0 release (rp-rs#312)

* Update changelog for 0.4.0 release

* Enable rt feature for irq example in Cargo.toml

* Bump pio/pio-proc deps to 0.2.0, update pio examples

* Update BSPs to latest ws2812-pio, remove unused pio dep

* Fix usage of pio_proc in doc comment

* Clean up pio doc-example

* Update rp-pico to latest i2c-pio

Co-authored-by: Jan Niehusmann <jan@gondor.com>

sparkfun-pro-micro-rp2040 0.1.0

rp-pico 0.2.0

pimoroni-pico-lipo-16mb 0.1.0

pimoroni-pico-explorer 0.1.0

adafruit-qt-py-rp2040 0.1.0

adafruit-macropad 0.1.0