Flyouts fade in/out.
Flyout's animation is faster.
Made one flyout wider.
Fixed documentation in ThemeManager.
Documented more of Accent.
Second pass on Documentation.
Merge pull request #753 from Amrykid/amry-documentation-r2

Second pass on Documentation
fix context menu with dark theme
introduce IsThemeChanged event
 nevent

and change theme of open flyouts
Merge pull request #756 from MahApps/746-punker76-thememanager-issues

[WIP] ThemeManager fixes/issues #746
Merge pull request #747 from Amrykid/new-flyout-animation

Updated Flyout Animation
Fixed FlipView banner flickering bug.
Removed comment from FlipView ShowBanner.
Merge pull request #759 from Amrykid/flipview-animation-fix

Fixed FlipView banner flickering bug.