Improve bioregions with topological features

[roalyr]

Add mountains to the bioregion layer.

Figure out how to treat water bodies (same region on georegions layer and on bioregions layer):
For instance, there is a lake. It is determined by flood-filling a specific biome as well as flood-filling specific watermask patch (which overlap, naturally).
Biome data can be omitted in narration... Or it can be mentioned as something like Lake X water area, while georegion data will be just stating Lake X. In the end result it could be written awkwardly as This is Lake X water area in the Lake X region.

[roalyr]

Georegions are basically continents, islands, seas, lakes, etc.
Bioregions are forests, deserts, tundras, mountains (I'd rather have them as such).

This will allow us to define locations like Forest X on the Y island, which is quite well and good, but what to do with water bodies in this case (so as to not to break the unification)?