only style formatting
use TemplateBinding to SwitchForeground

for checked color
fix OnLabel and OffLabel dep. properties
OffLabel
 and OffLabel
introduce MetroToggleSwitch style key
CustomMetroToggleSwitch example
fix column span for header
TemplateBinding for content font stuff
default HeaderTemplate
introduce ContentDirection property
 property

LeftToRight means content left and button right and RightToLeft vise
versa
Merge pull request #678 from MahApps/460-punker76-toggleswitch-issues

ToggleSwitch issues