[Taskbar Virtual Desktop Switcher] Add accent color

[Deen-0x]

Mod author: @sb4ssman

It would be great to add an accent color option for button background/border option.

[sb4ssman]

Will include.

[Deen-0x]

Will include.

Thank you!
It would also be useful to add multi-Monitor support (so the indicators can show on second monitor for example).
Keep the good work!

Edit: I saw you're aware of the multi-monitor limitation. I saw it in "known issues".