Added ability to stop registration

Script changes:
beforePlayerRegister(src)
sys.numRegistered(ip)
Merge remote-tracking branch 'ethan/master'

Conflicts:
	src/Server/scriptengine.cpp
	src/Server/scriptengine.h
Merge remote-tracking branch 'main/master'
Merge branch 'master' of github.com:coyotte508/pokemon-online