Revert "[Gtk] Partial workaround for embedding an NSView inside a ScrolledWindow"

No longer needed as GtkNSView has been patched

This reverts commit 82600dcb671e7c3ab7d743f15e098f09c73d39de.
[Mac] Make it possible for custom widgets to get focus
[Mac] Use becomeFirstResponder to focus the NSTextField

Although Apple docs list it as deprecated, becomeFirstResponder
works in cases where [NSWindow makeFirstResponder:] does not.
[Xwt.Gtk] Fix Gtk-Critical with the combo box entry backend
[Gtk] Don't show EventBoxes when only required for mouse event handling
Add XamMac backend
[Mac] Remove unneeded gtk reference
Added some attributes and type converters required by xaml serialization
[WPF] Remove all pixel scaling. We are using device independent pixels now.
Initial work to support multi-resolution images
No more font size units
Improve support for multi-resolution images
Improvements in the bitmap generation api
Bitmap generation fixes
[Mac] Fixed image rendering
[WPF] Implement hi-res icon support
[Mac] Implement ToBitmap
[Mac] Fix image rendering
Merge branch 'retina'

Conflicts:
	Xwt.WPF/Xwt.WPFBackend/FontBackendHandler.cs
	Xwt.WPF/Xwt.WPFBackend/ImageHandler.cs
Improve text layout handling

TextLayout can now be created without a reference
to a canvas or context. Fixed drawing of text when
using an image builder. Added text drawing tests.