Changes

Patch skin command, rename command (#1524)
* Fix npc skin -t argument order
Command input is doc'd as (and should function as) data then signature,
but the called method was signature then data... update calls it in
correct order. Also, fixes doc to indicate that a name is valid input,
not just uuid (not entirely sure how that is handled when sent out in a
packet, but it seems to be correct to feed a name)

* Ensure rename command will handle scoreboard changes
Always update prefix/suffix, not just only when team is newly created
Guarantee removal entity from scoreboard team on remove
fileheader screwup (first line changed in 1_12_R1 file)
non-used code bits (the two coloredName lines - they don't actually
functionally do anything)

* patch gamemode command
Uppercase + unique permission node

* patch for names of length 30
(commit: 42fda25)