Make foes with different abilities

[tehscott]

Added a 'healer' monster type. Heals other monsters in an aoe up to 150% of their max hp. 5% chance to spawn on non-boss rounds. Current aoe is 100, could be adjusted.

[tehscott]

Added new foe types: Splitter and Splitling. Splitter splits upon dying into 2-4 Splitlings with 1/2 the hp of the original Splitter. 5% chance to spawn on non-boss rounds.

Splitter cannot harm towers. Splitlings do.

[tehscott]

new foe ideas:

• heat kamakaze
  • chases tanks and explodes, giving heat (max hp?) in an aoe
• teleporting
  • teleports randomly. after taking damage?
• speedy
  • speed up as they get hurt
• heat return
  • return damage as heat to the tank attacking them. take 1.5x cold damage.
• berserk
  • deals damage to tower based on hp lost
• combination types
  • i.e. teleport-healer
• hungry
  • feeds off other blobs and becomes stronger. should gain more than what they took from the other blob. should gain the other blobs powers? can eat bosses?
• armored
  • takes 90% less damage. burrows when hit (doesn't move). kamakaze.

new boss ideas:

• spawner
  • spawns random foes at a (random?) interval
• teleporting
• speedy
• damage healing
  • goes back and forth between being healed from the damage they take
• spawner2
  • after given ticks, he loses x hp and spawns a massive # of foes

New bullets:

• add repair tanks
• mind control bullet (temporary?)