Button Bar

I've added buttons. They can be programmed, and with tomorrow code will work.

There can be any number of them (well, up to 254 anyway). They can be created within the game with commands like

Game add_button "Button_Down_Pic.png" "Button_Up_Pic.png" "ButtonDownScript" "ButtonUpScript"

This is  important so I can make levels work.

But, in a bit of a rush - so expect update soon.