TyperShader Concept

We need to be able to apply multiple shaders.

My idea was to have a list of "pairs". The first element in a pair is the Rect that should be processed. The second element in a pair is a list of "shaders". These can be represented by shader RIDs OR by indices that are for a specific shader array. I personally think it should be a list of indices.

This list of pairs is added to and modified whenever effects are added and removed from the text.