Use methods with rl.Vector(2|3) receivers for raymath functions

[jsbeckr]

It would be nice to have methods for all raymath functions like rl.Vector2Subtract.

Something like this

func (v rl.Vector2) Normalize() rl.Vector2 {
    return rl.Vector2Normalize(v)
}

would make this

test := rl.Vector2Normalize(vector)

more readable and shorter

test := vector.Normalize()

What do you think about that?

[gen2brain]

The question is, who is going to do the work, and who is going to maintain it? Raymath is already a rewritten version of raymath.h; it is probably not in sync with all the changes. Adding more incompatible changes to core raylib would require some work from someone, not a one-shot work that nobody would check later on.