First attempt at Smoke Bomb item talent - blocks LoS.
Implement concealment (miss chance) for smoke cloud.

Bump engine version number for 1.0.5.  Add string.him.
Fix description; make it a projectile.
Improve messages for item use.

Test Talent debug menu item.
Finish implementing smoke bombs
Clean up Object.useObject.

Replace base version to more cleanly implement new functionality.  Pull talent
message logic into new Actor.showTalentMessage and reuse from useObject.
Merge branch 'smoke-bomb'