Graphics PSIL Callback Rearchitect

[MikaylaFischler]

Elements will have an assigned PSIL reference and subscribing will be done through the graphics layer, allowing for automatic cleanup on element deletion.

Example:

elem.register("rps_trip", elem.update)

Or possibly with an enum:

elem.register("rps_trip", EVENT.UPDATE)

Allowing for an elem.delete() to both hide itself and unlink itself from the PSIL.

Final strategy:

elem.register(ps, "rps_trip", elem.update)

That allows for multiple PSILs plus using functions that use the given element but do other things as well, as in cases that append or calculate things based on the subscribed data.