Refactor OSC dictionaries

Mainly got rid of "shadow" groups in the SatieOSC class and therefore rewritten all methods to act on main Satie groups/dictionaries. Caveat: potential processes issue: The example process (in Satie documentation) works and helloWorld (from satie4unity) behaves correctly. sheefaProcess is giving me issues. I will look at it in more detail but maybe something is happening in the sheefaProcess code that is not exactly kosher...