Add render.DestroyRenderTarget(string)

[Rusketh]

I think most people would agree with me, that there should be a way to destroy render targets and clear them from memory.

My request is for render.DestroyRenderTarget(string name)

The string given to this function should be the internal name of the render target that was passed to GetRenderTarget( string name, number width, number height, boolean additive ).

I am guessing this functionality is not currently implemented for a reason, if so could you please specify that reason for future reference.