Final config update pass for the 2.6 branch

It is time.
Sync config changes

tl;dr: The old bug prevention workarounds we did are no longer necessary and Sync is now fully un-nerfed.
RR 2.6.17.4-EXP-RR XML update

This is the gold build. Any more tightening up and I'm going to choke this thing. :P
Rolling back Project: Red

Not ready for use, should have known better than to try a major update this late.
Last minute EnderNet removal

Apparently it has tons of world-killing bugs that we never found and Dave only decided to tell me this after I published the pack with it in.

Thanks Dave! ._.
Merge tag 'tags/v2.6.17.6' into serverExp