Fixed some warnings (mostly unused variables)
When a tile is marked to dig, if it is claimed by another team, it do not become undiggable
fixes #164
Cannons keep shooting at dead units
fixes #166
Also fixes bug where dead kobolds woke up until they disapear.
Workers can claim ennemy room
Merge pull request #169 from hwoarangmy/development

Small fixes : workers claim ennemy room + Cannonns keep shooting + sometimes, ennemy kobold can claim claimed walls