+ Added Widget::getClientChildrenBounds()
+ Replaced all member functions in Theme::draw_x() to Theme::paintX()
+ Move code to draw tabs from Tabs::onProcessMessage() to Tabs::onPaint().
At this moment the button isn't functional because the current frame
position is stored in the sprite (instead of the Editor). In this case,
when the "play" button is pressed, the mini-editor should show other
frames instead of the current one (should play the whole animation).
- Added Splitter::Type so it can be by pixel or by percentage.
- Added Widget::load/saveLayout functions and Widget::onLoad/SaveLayout
events.
- Added LayoutIO interface so we can delegate the serialization of the
layout.