Fix unbreakable regression

Closes #721. Zonemakers can modify blocks in an unbreakable zone when outside of it again.
Prevent block duplication

Closes #722, closes #723. War prevents thieves from messing with their inventory and anyone from messing with their block head.
Maybe closes gh-517

returns the code after the leaving of the zone. Not sure if it works.
Don't think it returns under all cases

Conflicts:
	war/src/main/java/com/tommytony/war/Warzone.java
Merge branch 'master' into nimitz-v2

Conflicts:
	war/src/main/java/com/tommytony/war/Warzone.java