v0.8.0-preview.200123.0

https://www.nuget.org/packages/ModernWpfUI/0.8.0-preview.200123.0
https://www.nuget.org/packages/ModernWpfUI.MahApps/0.8.0-preview.200123.0

Notable changes:

• DataGrid: Show scroll bars inline
• Add support for WindowStyle.ToolWindow
• Improve TextContextMenu
• Add localized strings
• AutoSuggestBox: Fix issue where header and description were not shown
• Fix exception when adding AppBarToggleButton to CommandBarFlyout
• Add BackButtonCommandTarget property to TitleBar and HamburgerMenuEx
• Fix issue where setting the CornerRadius on a NumberBox only applies if the SpinButtonPlacement is set to Inline (#25)
• Improve keyboard support for SimpleTimePicker, ContentDialog, and ToggleSwitch
• Flyouts: Restore focus when closed
• Make AutoHideScrollBars more configurable
• Improve TabControlPivotStyle:
  • Arrange headers in a single scrollable row
  • Add support for Title, LeftHeader, and RightHeader
  • Selected content now aligns with headers
• DefaultWindowStyle: Add Setters for FontFamily and FontSize