Merge pull request #60 from Rutherther/feat/combat-v1

Make combat nonblocking, make multiple queues for distinct operations

feat(combat): update operations to be non-blocking, add support for handling waiting

Merge pull request #32 from Rutherther/combat

Add combat extension

feat(combat): return current target from combat technique

docs(combat): add missing documentation

feat(combat): add simple attack combat technique