iFS_FusionSystemMZ Finished

Whew, that was a long one.. The port is finished, and the process has taught me a lot! That said this consolidates the normal Fusion and the optional Equipment Fusion mechanics into one handy-dandy script for use in RPG Maker MZ projects. This is the first functional version of the port that I am comfortable with, but please expect bugs that will be lined out. Also please comment about compatibility issues that I may need to address.