Tower defense#1

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Diana-ou wants to merge 21 commits intomainfrom

Commits on Oct 5, 2022

Adds global vars, basic enemy spawning and pathing, some placeholders
cyu2019
committed

Commits on Oct 15, 2022

Commits on Oct 16, 2022

Adds Lighting, Button Sprites, Recorded MVP video
cyu2019
committed

Commits on Oct 23, 2022

10/22 changes, adds upgrading, ground texture, enemy sprites, various small changes
cyu2019
committed

Commits on Nov 5, 2022

fixes extra spawns bug
cyu2019
committed

Commits on Nov 13, 2022

Adds air strike, time slow, different enemy types
cyu2019
committed

Commits on Nov 14, 2022

Better Tower AI, start UI, I forget what else I changed
cyu2019
committed

Commits on Nov 19, 2022