Should nene change type sizes?

[Andre-LA]

Some types like Vec2 and Rect uses number and integer types, which the size can be either 4 or 8 bytes.

While it's true that the size can be changed with metaprogramming, maybe the default Vec2 and Rect should use 32-bits size instead and provide a way to customize it with an -D flag or with a meta-programming option like in löve's config files (maybe global Nene.config.vec2_subtype = uint16?).

[Andre-LA]

nene it's being rewritten to C, I'm open to feedback (#13), but for now I'm using int32_t and float types for nene's math.