HUGE Improvements

Fixed:

- It's now impossible  for the  level generation to get stuck in an endless loop.

- Towers can no longer be placed on the inside of the track on the walls which allowed for tower stacking.

Added:

- Surrounding area around the generated level.

- Health bar, once it reaches 0 the level will regenerate.

- Players can now choose the track length before the level generates.

- Water Shader.

Changed:

- Camera can now rotate with 'Q - E' (Cancel Placement moved to 'X').

- Enemy Health Scaling increased to increase difficulty on later waves.

- Main menu background changed to reflect the new level generation.

- Various improvements to performance, mainly changing Rendering Pipeline to URP.

- Some tower balancing.