New map!

Added a new map. I won't use UE4's landscapes anymore, since I can have relatively low-poly, good-looking landscapes using static meshes (I'm targeting mobile with this game).

I planned to switch the buildings with instanced static meshes, but currently there's a bug where the lightmaps look all messed up on them (might be Linux only, since volumetric lighting and distance fields don't work on Linux) if you know anything about this bug, please help me if you've got the solution.