Add experimental NMS inheritance for plugin remapping

Enabled by bukkit.yml mcpc.plugin-settings nms-inheritance
Fixes NMS inheritance test case with WorldServer getTileEntity:

https://github.com/agaricusb/IncompatiblePlugin/commit/0517f5b05e8c13ff8c2814b0296a31573a7c93ff
Update for single inheritance refactor in SpecialSource
Add plugin class inheritance

Loads inheritance when the class is first loaded. Passes IncompatiblePlugin
NMS inheriting test case, but could use further tweaking.
Enable plugin inheritance remapping