Mortar Attack Integration
work on #49
- Cleans up the MortarAttack script.
- Adds the mortar launcher to the boss prefab, and adds the mortar attack to the turbo state.
Mortar Explosions
work on #49
- Added a script to allow things to explode when they die.
- Cleaned up mortar code to make it more performant.
- Added mortar configuration to base spider tank state so that all states can use mortars.
- Re-added the ability to have the death system send a death notification more than once (disabled by default, used only by the boss healing shield for now).
Boss Health Update.

I updated the Bosses HP to 8000 and the healing interval to 1500. This
should extend the fight and also prevent instahealing. Ill make more
adjustments as we add phases. (Also I couldn't find where to adjust the
minion cap.)
Spawn Point Work
- Added health indicator to spawn points.
- Fixes errors related to mortar strikes.
Merge pull request #110 from ModSquadWorkshop/MortarStrike

Mortar strike
Mortar Lead
- Mortars can now be set to lead their target.
Merge pull request #113 from ModSquadWorkshop/MortarStrike

Mortar Lead
Merge remote-tracking branch 'origin/master' into drop_system

Conflicts:
	Assets/Prefabs/Bosses/Minion.prefab
#26  DropSystem
-In progress work on gun drops