Switch to pntr and pntr_app

[RobLoach]

• [x] Audio, play/load (wav, ogg)
• [ ] Audio - volume
• [x] File system Assetsys/PhysFS
• [x] Graphics: rectangle
• [x] Graphics: clear
• [x] Graphics: point
• [x] Graphics: line
• [ ] Graphics: quad
• [x] Graphics: imagefont
• [x] Graphics: circle
• [x] Graphics: ellipse
• [ ] Graphics: draw image rotated and scaled
• [x] Graphics: arc
• [x] Input: Joysticks
• [x] Input: Keyboard
• [x] Input: Mouse
• [ ] System: Clipboard
• [x] Timer: Delta
• [ ] Timer: FPS
• [ ] Window: Gettitle
• [x] Window: Set Title
• [ ] Window Show Message Box