Tracking issue for SDL port

[cmlsharp]

Todo:

• GArc (Easy)
• GInteractor (Hard)
• GImage (Easy)
• GRoundRect (Very Easy)
• G3DRect (Unsure, I have some questions about this)
• Key, action and timer events (Medium)
• GTimer (Easy)
• GSound (Easy)
• install target in Makefile (Easy)
• Decide what format the library should take (LLVM bytecode, JS, etc.)
• Graceful error handling on SDL failure (Easy)
• Removing buggy/misleading features (creation of "bst of doubles", exceptions) (Medium, depending on how much of the code relies on these features)
• Decide on which fonts to support