Can't add IAngles

[jojotastic777]

IAngle has no .add function (or any other arithmetic function, for that matter.), but you can add them in lua with +. This presents a problem. We can't even ask the SF devs to implement it, because such a function doesn't even exist in GLua.

EDIT: A temporary solution to this would be to define a function that adds the angles together in a library, sort of like the one that ports all the typescript array functions.

[jojotastic777]

UPDATE: Garry's mod now has an Angle:Add function, but starfall still hasn't implemented yet. Perhaps I, or someone else, should make an issue on the starfall github about this.