Initial code to make FlipView MVVM friendly.
Reworked PrepareContainerForItemOverride

Stole some "PrepareContainerForItemOverride" code from MetroTabControl.cs.
Oops. ItemsTemplateSelector should work now.
When clicked, the FlipView should focus.
Basic, psuedo-mouseover glow.
Better glow thingy. Added Orientation.
Rebase madness.
Slight visual glitch fix.
Merge pull request #1040 from Amrykid/flipview-v2

[WIP] FlipView v2
introduce NonActiveWindowTitleBrush to handle deactivating title bar brush
Merge pull request #1320 from MahApps/1163-punker76-inactive-titlebar-color

introduce inactive title bar brush
better active/inactive window title color handling to avoid theme manager bug
Merge pull request #1324 from MahApps/punker76-better-active-inactive-window-title-handling

better active/inactive window title color handling
active/inactive border brush handling for clean window
minor fix for clean window title color
revert Click on Expander header support (reverted from commit d56c0e5f5052118acc01ae8f2fe7154b82900170)