UFO Decon

Updates from previous version:

Still runs very poorly in Web build

Blocks now change materials to a green tint once they no longer cause damage to the player, as well as add a red flash when damage is dealt to the player, both providing better feedback for the player and their health. 

Added a minimap via Render texture to better show players the locations of objective glowing orbs, as well as better forwarding of tall buildings that can be hard to see from some angles due to the camera clipping that keeps the player in view underneath some structures. 

Improved bombs, added vfx, and fixed several issues in which bombs would not detonate, or would have little impact on the surroundings. 

Added additional control support for arrow keys or controller support.

Added SFX feedback when buying ship upgrades.

Added physics material to objective orbs to reduce the speed at which they roll away after being freed from towers.