xaml formatting
use template binding
introduce PART_Icon
introduce IconTemplate property
introduce TitleTemplate property
fix #1124 TitlebarHeight <= 0
minimalize window commands examples
introduce LeftWindowCommands
lesser margin for commands content
fix possible null pointer exceptions
introduce MetroWindowButtonSytle

IronicallyNamedChromelessButtonStyle is obsolete in next release
introduce min, max, close button style properties

+  new dep properties WindowMinButtonStyle, WindowMaxButtonStyle,
WindowCloseButtonStyle
fix typo
xaml formatting
larger clean demo
inherit clean window style from metro window
check titlebar show state
adapt clean window style
no FocusVisualStyle for toggle button
the icon should be over the label (clean window)