Removed old gui.

Game is not playable at this state.
Updated some gui code.
Fixed some errors.

Panel should now validate components in a more correct way.  Panel is
now using glScissor to hide components that is outside. Upper bar is now
drawn correctly in TetrisWindow.
Added GridLayout and BoxLayout.

GridLayout is finnish butnot tested.
BoxLayout is not implemented yet.
Fixed a error.

Forgott hGap(0).