Feature Request - Custom Trigger Rendering

[Viv-0]

Triggers in Ahorn have the ability to render with custom code, but Loenn triggers do not.

Since Triggers have a drawable system that renders all text after rectangles, this will need to be split up into a list of size 3,
one to replace the default drawing state of the rectangle and any content going between drawable and text
one to replace the text as a string (for textBatch) or "" yielding no text to be added to the batch
one to be drawn over all trigger text within the layer