Zombie Fortress 0.4.7 Released

Changes from 0.4.6 to 0.4.7
- NEW Survivor: The Engineer.
- When a sentry is built, it cannot be upgraded/repaired/refilled with ammo/demolished. However, it is still able to attack. Sentries beginlosing health as soon as their construction is complete taking 5 damage per second which will destroy a sentry in 30 seconds.
- A sentry will run out of ammo after dealing roughly 450 damage worth of shots.
- Dispensers when constructed are disabled and are to be used as barricades against the ravaging undead.
- Both Sentries and Dispensers cannot have their build time accelerated by whacking them repeatedly with a wrench. They take 10 and 20 seconds, respectively to be built.
- Engineers no longer have access to the shotgun. Sentries, their pistol with outrageous ammo and crit-happy wrench will have to suffice.
- Auto-Balance Fix: You should no longer be a Zombie three times in a row. You will automatically be assigned to the survivor team.
- Various fixes and optimizations.

Once all the bugs in 0.4.7 are found and fixed, the next version of Zombie Fortress will be 0.5.0.

Current Code Length for 0.4.7: 967 (+129 from 0.4.6)