Fixed|UI|Client: Games dialog opens a network settings dialog

The Games dialog should only open a network settings dialog when
showing the multiplayer sessions.
UI|Client|GamesDialog: Cannot switch to the currently loaded game
libappfw|GuiRootWidget: Utility for moving a widget on top
libgui|VertexBuilder: Applying a transformation
Refactor|libappfw: Animating procedural images, fold panel indicator

If a procedural image is animating, it will return indication of
that from its update() method.

The fold panel indicator now turns 90 degrees with an animation
depending on whether the fold is open or closed.