Rolled back some of the water colors from green to blue

Minor update:

- Improved performance when using "terrain map mode", it still looks blurry so I don't recommend using it but at least now you also get a reduction in GPU usage compared to the previous version

- Made the overall map less dark

- Made water more green, less blue. if you don't like it LMK

- I readded seasons in the previous versions which caused rivers to look bright white when frozen over, this doesn't look good so I removed the freeze effect entirely. Might fiddle with this again in the near future

Minor update

- Changed river colour to a slightly darker blue for a more natural look. Keep in mind rivers are very simplistic to reduce graphical strain.

- Readded seasons. This wont affect performance while looking ever so slightly better.

- Decreased file size from ~19MB to ~12MB