Faster/Less intensive rendering in 2D mode

[NinCollin]

Has your feature request already been suggested? Please check if your suggested feature has already been suggested. #193 shares some similar ideas, but my issue deals with specific possible optimizations.

Is your feature request related to a problem? Please describe. Currently, 2D mode uses the full textures, and using a render distance that would be high in-game (say, 32-50) uses roughly 9GB+ of RAM, but only shows a tiny portion of an actual world.

Describe the solution you'd like One solution would be to use single colors to represent blocks when zoomed out (instead of trying to use default textures for thousands of blocks)

Using a less-detailed algorithm when zoomed far out (similar to Minecraft's zoomed out maps, where 1 color pixel represents multiple blocks) could also be beneficial.

Showing the map with decreasing levels of detail when zooming out would likely improve performance and usability