Post Jam Overhaul

I've taken some feedback and made major rebalancing changes, and the game plays way differently now.

Enemy AI Changes

- enemies now retreat at higher health

- enemy artillery units will now stop advancing when they shoot

Balancing Changes

- larger hulls given a buff to make them more usable when considering the tradeoff in speed

- flamethrower nerf

 - artillery bullets now move slightly faster

- Barriers, Boomerang, and Canyon nerfed to compensate for the smarter enemy artillery AI

Quality of Life

- removed heat mechanic (pretty sure no one liked this; the game is honestly probably better off without it)

- improved capture progress bars

- added unit queue system

- added toggle button that stops build menus from popping up if you want to just spam a queue and focus solely on commanding

- camera now moves when the mouse is near the border, making the game completely playable with just the mouse

- added new restart and quit buttons in the settings menu

- added hotkeys for menu buttons

Other Polishing

- added bullet trails and tank trails