FIXED: EventHadler

[value1, value2][condition] can't work in this situation
CREATED: RTS.gui, Button, logo MOVED: GLTexture

Created new package RTS.gui. Created new class RTS.gui.Button. Moved
RTS.main.GLTexture -> RTS.gui.GLTexture. Edited RTS.__init__.py
UPDATE: references in RTS.main.InGameScreenManager

Fixed import of RTS.gui.GLTexture in RTS.main.InGameScreenManager