RR 2.4.15-RRC5 update

Last final changes.

This is 2.5.0 done.

Now for backend polish.
File structure adjusted

Also updated Extra Cells to 1.6.1 because people insist on interrupting important work and being pushy :3
Config correction for Extra Cells
Exhaustive reorganisation of the XML

No actual changes, just reorganised.
RR 2.5.0-RR complete

Going all Rafiki in here time-wise.
Updating shipped version of MCPC+

Fixes some bugs for MCPC+ users. MCPC+ is not a part of the modpack proper and so can be stealth changed at will. :)
Created Experimental Branch XML

Currently no changes from 2.5.0, placeholder
Merge branch 'master' of github.com:velotican/ResonantRise