Apply taskbar customizations to News and interests

Fixes #676

Fix custom button auto-hiding (#2041)

Update StartMenu.html (#2036)

Display "Searching..." progress always

Commit be8568c that introduced option to disable "See more results" also
changed behavior of "Searching..." item that indicates search in progress.

We will now make sure that the search progress indicator is displayed
always. No matter of options.

Show shutdown warning if there are multiple users logged in (#1303)

Properly scale default skin font according to DPI (#1110)

Original fix introduced in 528d15 was not correct.
The problem is that `SystemParametersInfo` uses DPI that current session
started with.

We should use `SystemParametersInfoForDpi` (available since Win10 1607)
that returns properly scaled font size.

Fixes #1110

Setup: Recognize also /h and /help parameters (#1278)

Otherwise they will get passed to `msiexec` that will display its help
window that may confuse our users (as they expect our help to be displayed).

New default Immersive skin for Win10/11 (#538)

Fixes #538

Select Apps icon based on Windows version

We now have nicer Apps icons for Win10/11 so we will select proper icon
based on Windows version.

Make sure tray buttons are properly positioned when custom start butt…

…on was created

Fixes #1232