[WPF] Add support for multi-size icons
[WPF] Fix Canvas rendering issues

Don't substract the margin from child allocation (margin is not included in
the children bounds).
Don't set the background of the WPF Canvas. The background is rendered in
the default implementation of OnRender, which we need to call after we do
our own rendering, since it also renders the child widgets. So if we set
the background, it is drawn over the custom rendering.
[WPF,ScrollView] Properly initialize the placement of the content child
[Xwt.Motion] Add standard Xwt object interpolators
Add ExpandAll method to TreeView
Add Visible property to CellView
[GTK] Honor CellView.Visible
[Mac] CellView improvements

Implement Visible property.
Add support for editable cells.
Implement CheckBoxCellView
Add editable text column to ListView sample
Implement the animation ticker using the main loop
[Xwt.WPF] Fix Paned backend to set children panel size to 0 when it contains no child widget
Fix several size calculation issues in Window and Dialog
Fix references to projects. ;D
Merge pull request #228 from Therzok/master

Fix references to projects. ;D
Implement password entry for GTK and WPF.
Merge pull request #230 from bojanrajkovic/password-entry-widget

Implement password entry for GTK and WPF