…askbar`

The setting was improperly named and evoked that custom button should be
"moved" to the corner of screen even for center aligned taskbar on Windows 11.

What the setting does (and always did) is to align button to the edge of
taskbar (e.g. bottom edge in case of bottom taskbar) instead of centering it.

Hopefully it will be now more clear.

It may happen that during `InitStartMenuDLL` execution some component
posts a message that is then intercepted by (still active) `HookInject`
that will call `InitStartMenuDLL` again (and everything will repeat).

To prevent such endless recursion during initialization, we will make
sure that `InitStartMenuDLL` will be executed just once.

Update the old blurry start menu previews to a more modern pixel-perfect ones that resemble the new default immersive skin.

There is no need to limit it just to Win10+ as it works well also on
older Windows.

#1866

It uses metro colors so it works only on Win8+.

#1866 (comment)

Windows 11 22H2 introduced new touch-optimized taskbar for devices with
touch screen.

It seems that in this mode taskbar window size is bigger than actual
taskbar on screen. There is region defined for the window that covers
actually displayed portion of the window.

We should account for that region (if present) when obtaining taskbar
window dimensions.

More info about how to enable/disable touch taskbar:
https://www.elevenforum.com/t/turn-on-or-off-tablet-optimized-taskbar-in-windows-11.5133/

It seems that AllSystemSettings file name changed since 24H2.
We will look for new file first and then fall-back to original one.

Fixes #2033.