Add extra lexing/parsing.

[Marisa]

Need to be able to parse out the following:

• Vector2 : Currently there is no way to set a value to a Vector2, this needs to be remedied.
• default_font font types: Currently you can only set the default font to a dynamic font, not a bitmap font.
• Rect: Currently, there is no way to set a value to a rect (x,y,w,h), this needs to be remedied.
• Enums: There are a few enums in the UI, and making end users have to remember 0,1,2 for them won't work, we need a way to define enums.

Edit: Removing the default_font font types, as bitmap font doesn't really seem usable, so going to force people to use dynamic fonts.