Balance, Bugs, and workshop

Balance changes:

Hard + Impossible Upgrade Locking

Both hard and Impossible can now lock 1 more upgrade.

• Hard can now lock 3 upgrades from being picked, the computer will select 1.

• Impossible can now lock 2 upgrades from being picked, the computer will select 2.

Impossible difficulty upgrades

• Reduced spawn rate upgrade from 4 -> 2.

Human

• Robotics lab spawn amount decreased from 5 -> 4.

• Robotics lab spawn rate increased from 14 -> 18. 

General

• Updated the evolution text for negative armor to be more understandable.

Engine

• More garbage collection and memory checking.

• Found more places where we needed to convert from raycasting to spatial grid.

• Fixed a small null ref bug on targeting from buildings.

Level editor

• Fixed another upload issue.