Fix buttons with appearance

[Nuklon]

Pull request type

Please check the type of change your PR introduces:

• Update
• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes

What is the current behavior?

Fixes 3 issues.

1. Currently the Primary appreance button sort of gets moved up due to missing MouseOverBrush. You can see this here:
   
   Right one has mouse over.
2. Adds an alternative border thickness (0,0,0,1) for buttons with colors. Right now it used 1,1,1,1 but this
   a. doesn't match WinUI style
   b. causes the border shadow to flow over the sides. Fixed version:
   

[Nuklon]

3. Also fixed the border brush when selected. With WinUI, the pressed border brush is identical to the background of the button, (and not transparent).

[Nuklon]

Fixed remaining colors, they now look almost identical to WinUI. Depends on #1492.

[Nuklon]

Comparison (WinUI left, WPFUI right):

[Nuklon]

New version added with an inset border, which is sort of what WinUI also does.

[Nuklon]

7a3eff8 fixes dark mode secondary buttons having persistent border. Also added some comments to clarify.