Bullet Visibility Fix
- Adds a separate prefab for the pistol bullets and the assault rifle bullets, with the pistol bullets being larger to indicate they do more damage.
Reworking Spider Tank State System
work on #77
- Removes state change code from main SpiderTank script, now the states need to manage their own transitions.
- Currently only the Basic State really works.
Spider Enters from Outside Arena
work on #77
- The boss starts outside the arena and then walks into it through the wall.
Spider Tank Initial State
work on #77
- Adds script for spider tank's initial script.
- Spider tank now waits until all minions have been killed before entering the arena.
DeathSystem
work on #77
- Adds a DeathSystem script to act as a common place for destroying objects when other objects may be listening for their death.
- Removes HealthSystem.DeathCallback and replaces existing usage with the new DeathSystem.
Spider Tank Health Triggers
work on #77
- SpiderTank script will now notify states once a certain amount of health has been lost.
Spider Tank Healing State
work on #77
- Spider tank will now leave the arena and heal itself after tanking a set amount of damage.
- Spider tank will return to all arena after all minions have been killed.
Re-Enable Turbo State and Laser Spin
work on #77
- Adds the turbo state and the laser spin back into the state rotation.
- Fixes a bunch of bugs in the ordering.
Minion Spawning During Flee State
work on #77
- Changed Timer.IsTicked() to Timer.ticked and Timer.IsComplete() toTimer.complete.
- The FleeState for the Spider Tank will now spawn minions to deter the player from destroying the boss while it moves to hide.
Balance & Bug Fixes
work on #77
- Fixes error spew when spider tank is destroyed.
- Added a bit more entropy to the process of transitioning between spider tank states to increase the likelihood of seeing all the different attacks.
- Various numeric tweaks to better balance the new system.
Merge branch 'master' into alpha_boss

Conflicts:
	Assets/Prefabs/Bosses/Flanking Minion.prefab
	Assets/Prefabs/Bosses/Minion.prefab
Merge pull request #82 from ModSquadWorkshop/alpha_boss

Alpha boss