Added a "Clean.xaml" file which auto imports every "Clean" control style. Added a CleanGroupBox style.
Adapted header stuff from the original MetroGroupBox style.
Fixed the rebase.
Tweaked the CleanWindowDemo.
Updated the CleanWindowDemo again to kind of look like @flagbug 's Espera.
minor documentation...
remove unused isDragging variable
rework the show system menu

show the system menu on
- icon
- if mouse yPos <= TitlebarHeight
- UseNoneWindowStyle = true
introduce ShowSystemMenuOnRightClick
remove more unused stuff
Use the accent color as focus brush for the textbox in the input dialog

Fixes #1412
Might a disabled Textbox, RichTextbox and PasswordBox a bit more visible

Fixes #1410
Merge pull request #1117 from Amrykid/more-clean

[WIP] Clean style updates
introduce ShowWindowButtonCommandsOnHiddenTitleBar
minor change to MetroBaseWindowButtonStyle

move content template triggers to style triggers, so we can better
override it
Merge pull request #1414 from MahApps/punker76-titlebar-enhancement-etc

titlebar enhancement etc...
fix remaining GlowBrush
Merge pull request #1424 from MahApps/punker76-MetroWindow-GlowBrush-remains-fix

fix remaining MetroWindow GlowBrush when hiding window
Merge pull request #1419 from MahApps/fix-input-dialog-focus-color

Use the accent color as focus brush for the textbox in the input dialog
Merge pull request #1420 from MahApps/fix-disabled-textbox

Make a disabled Textbox, RichTextbox and PasswordBox a bit more visible