minor
introduce MetroButtonCommandPasswordBox
introduce ButtonFontFamily attached property
use ButtonFontFamily attached property (TextBox)
renaming...

MetroButtonCommandPasswordBox ->MetroButtonPasswordBox
fix using new style key MetroButtonPasswordBox
renaming

ButtonCommandMetroTextBox -> MetroButtonTextBox
Merge pull request #1097 from MahApps/993-punker76-ButtonCommandMetroPasswordBox

introduce ButtonCommandMetroPasswordBox
ShowWindowCommandsOnTop for window buttons too

Hide Window button commands when ShowWindowCommandsOnTop is false.
Merge pull request #1098 from 100GPing100/patch-7

ShowWindowCommandsOnTop for window buttons