Update FlatSlider.xaml

User can define width of vertical slider / height of horizontal slider
Update Icons.xaml

Added the following icons:
appbar_bold
appbar_italic
appbar_underline
appbar_font
appbar_fontsize
appbar_fontsize_increase
appbar_fontsize_decrease
appbar_textcolor
appbar_marker
Update TransitioningContentControl.cs
Update MainWindow.xaml
Update MainWindow.xaml.cs
Update GlowWindow.xaml.cs

Fixes the cursor when owner.ResizeMode is ResizeMode.NoResize or ResizeMode.CanMinimize.
Merge remote-tracking branch 'MetroBehind/master'
NumericUpDown now support changing the value by using the mouse wheel.
Reset internal values on OnPreviewKeyUp
Do not speed up increment/decrement when mouse wheel is used.
Add possibility to increment/decrement the value even if the control has not the focus.
Changed watermark margin to same settings as in textboxes
Removed GetFocus subscription
NumericUpDown border color when focused under dark theme is now correct

Fixes #980
When custom string format like "{}{0:N2} pcs." after focus lost the value was not updated if the use changed the content of the TextBox
Create method to internally set and format TextBox text
Remove "pcs." from Text when StringFormat is "pcs. {0:N2}"

now also a StringFormat like "pcs. {0:N2} pcs." works
Handle immediate Value input
#references #938
Correctly reset value if coercing
Added MainWindow changes to show
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