TF2 Mobs

Added some diversity to mercenary loadouts. Almost every merc has got an alternative primary and a secondary to spawn with and an updated AI to properly use it:

Heavy:

1. Tomislav, Huo-Long Heater, Natasha.
2. Shotgun

Scout:

1. Shortstop
2. Mad Milk

Engineer:

1. Widowmaker
2. Short Circuit

Sniper:

1. Huntsman
2. Jarate

Soldier:

1. Direct Hit
2. Buff Banner

Medic:

1. Crusader's Crossbow
2. Quick-fix

Pyro:

1. Phlogistinator
2. Flare gun

Demoman:

1. Loch-N-Load

Spy:

1. Ambassador

Other changes:

• Mercs now can spawn wearing armor (configurable)
• Mercs now react slower to a target after restoring line of sight with it. Before it was immediately.
• Mercs now teleport to their hold point after some time if they are stuck somewhere and can't get there by walking.
• Fixed mercenaries' melee damage being incorrect.
• Chargin' Targe improved to be more useful and more like it's counterpart from TF2.
• Jarate texture and model changed.
• Updated building textures (mainly fixed some cube faces not being colored)
• Retextured engineer because the old model and texture were too messed up.

Added Voice Commands (without the voice). Similar to how it is in TF2: the player presses "Z" and then a number button on keyboard. The Commands are:

1. Medic! - Makes nearby medic heal the player if he's not too busy
2. Help! - Aggroes nearby friendly mercenaries to whatever is attacking the player
3. Go! Go! Go! - Makes THE CLOSEST owned by player merc go where the player is looking
4. Activate UberCharge - Makes medic activate ubercharge

Each individual command can be binded to any key but all of them are accessed by pressing "Z" + 1-4.