Add InitWrapperWidget to support overriding of an embedded widgets WndProc
Add externalwidgets example
Merge branch 'master' of https://github.com/ZhuBicen/walk into test
Widget, WidgetBase: Add SendMessage method
Use SendMessage method instead of func where possible.
Add SystemColorBrush
TabPage: Use SystemColorBrush for background
ComboBox: Raise CurrentIndexChanged also when pressing cancel or losing focus
ComboBox: Better CBN_SELENDCANCEL handling
Handle NaN, -Inf and +Inf when formatting floats
examples/webview: Some cleanup
AUTHORS file updated
TextEdit: TextLength, ReplaceSelectedText functions
TextEdit: AppendText function
LineEdit: set SizeHint and Greedyness based on MaxLength

This way LineEdits that accept only few characters and are intended to
be short, will not be grown indefinitely. Lineedits without a MaxLength
specified (or more specifically, with MaxLength > 80) will still be
Greedy (default MaxLength is 32767)
Merge branch 'master' of https://github.com/tajtiattila/walk
Add beginnings of declarative sub package and example

The declarative package reduces the amount of boilerplate required to build a GUI in code
declarative: Clean up repetitive Container creation code
declarative: Continue cleanup and improve layout support
declarative: Replace HStretch + VStretch with StretchFactor