decorated button
	modified:   GuiTest/GuiTest.cbp
	modified:   GuiTest/TestGui.cpp
	modified:   GuiTest/TestGui.h
	modified:   README.md
	new file:   StiGame/DecoratedButton.cpp
	new file:   StiGame/DecoratedButton.h
	modified:   StiGame/StiGame.cbp
	modified:   StiGame/StringRenderer.h
	modified:   StiGame/Style.cpp
	modified:   StiGame/Style.h
	modified:   StiGame/TimedGameAction.cpp
	modified:   StiGame/TimedGameAction.h
	new file:   assets/gui/button_bg.png
	new file:   assets/gui/button_left.png
	new file:   assets/gui/button_right.png
	new file:   assets/gui/hbutton_bg.png
	new file:   assets/gui/hbutton_left.png
	new file:   assets/gui/hbutton_right.png