Auto fit functionality for Buttons.
Uses Sprite instead of texture for panels.
Bug fix! Panel without sprite is drawn correctly.

And moved code to cpp file.
Changed LayoutManager for bar in the play panel.

Better results.
Removed unused parameter to function.
Removed unimplemented horixontal layout.

Added HorizontallLayout. Alignment can now be setted in HorizontalLayout
and VerticalLayout.