Fixed mouse strafing, began optimizing keyboard strafing
Optimized key combos for advancing
Keyboard strafing tuned, can now retreat from any direction
Reenabled combat AI, started working on key remapping
Combat tweaks, see extended description

- Altered strafing distance to 64
- Fixed retreat jitter by changing distance from 96 to 90
- Added Player.combatStats object, which keeps track of current
combatant
- Player's current combatant will only change when the attack button is
pressed, instead of just moving the cursor
Tweaked damage adjustments from holding/giving up ground
Merge pull request #4 from Zacqary/WASD

Began optimizing WASD controls. Cursor still needs to be rethought.