Update all csproj files to be consistent and include global assembly info
iOS: Rename iOS projects to eliminate confusing/conflicting names
Mac: Make TabPageHandler subclass MacContainer, Implement TabPage.Enabled
Implement Control.PointToScreen/PointFromScreen on all platforms (renamed from ScreenToWorld and WorldToScreen)
Control.MouseDown/Up events and bubbling are now more consistent across platforms
WinForms: Added ApplicationHandler.BubbleMouseEvents option to enable/disable mouse event bubbling (enabled by default)
Mac: Tweak GroupBox preferred sizing (again)
WinForms: ApplicationHandler.EnableScrollingUnderMouse option now works for more controls (not just scrollable panels)
Wpf: Control.BackgroundColor defaults to return transparent, not black
Wpf: TableLayout empty cells now use FrameworkElement instead of Control (so no need to set IsTabStop, and is lighter weight)
Wpf: Drawable should unregister from parent scrollable if it is unloaded
Cleanup
Mac: Fixes for Control.PointFromScreen and Mouse.GetPosition()
Move TreeGridItem.Tag to GridItem.Tag
iOS: Implement Control.PointToScreen/PointFromScreen
WinForms: Set Control.Parent to null when parent is set to null (e.g. removed from a container)
Implement Control.Location to get a control's location relative to its parent