Balance patch.

Fix sniper's infinite loop when retreating.

1. Further decrease spawn rate.
2. Loot increased.
3. New skills for some enemies.
4. Animation rework for some enemies.
5. Alignment of fx and sprite is finally fixed.

Balance and bug fix:
1. Most enemies will no longer ignore marks.
2. The doctor will no longer inject himself.
3. Give the officer an ability to stack buffs to his comrades.
5. The sniper will not be in group with other soldiers now.
Gameplay Changes:
1. Change the name of most enemies to make them sound more "professional".
2. Soldier encounters will have loots now.

minor fixes

Balance Patch:
1. nerfed sniper's aiming skill
2. lmg's debuff no longer applies when not hit
3. minor fixes

Balance patch:
1. nerfed the ridiculous crit value of grenadier
2. nerfed rifleman's damage
3. nerfed lmg's damage

Lowered the spawn rate even more, now the possibility of a soldier encounter would be much less.