Biome redo

[DokimiCU]

The original biomes were just minimalistic placeholders. This is a full system.

This can be treated as a stable final biomes system (hopefully). Any more biomes will start getting cluttered. Likewise, more species could be added, but most biomes have enough stuff.

See mapgen Readme for info on layout.

Addresses issues:

• 40 balance for beginners: e.g. panasee fruit, forest shelter, more gradual transitions between easy and hard locations, more frequent wet clay.

• 40 balance for advanced: e.g. nerfed overpowered Tangkal forests as food source, nerfed frequency of loam soils.

• 40 balance for multiple strategies: so far seems to favor more travel over just farming, each biome fairly different.

• red ochre (but no crafts) #43
• wet soil layer #104 (might need tweaking if you want it more common)
• closes #22 biomes issue
• much more interesting map!

Changelog:

• new biomes system, with new top soils
• new trees: Panasee, Daoja, Amma
• new plants: jogalan, orom, veke
• new seaweeds: Imoaru, Koaeako, Nagaeo (and renamed existing to match naming style)
• new hard_wood group replaces maraka wood crafts
• red ochre
• soil intrusion ores
• replace out of date menu backgrounds

Follow up:

• play testing (I've only done a little for such a major change. All design and testing was done in Valleys mapgen.)
• add red ochre paint
• A fire tolerance system? (dense forests are much more vulnerable to burning down now).
• maybe some new crafts/health effects to get full use out of new species.
• maybe make medicines and oil crafts based on groups rather than species (didn't touch this because health code is unfinished)
• a couple of top soils have become unneeded legacy (only from experimental biomes)
• localisation might need updating

Adding proper biomes is something I'd been wanting to do properly for a long time. I think that will do me for a while!

[jeremyshannon]

Ooh, looks nice. A fire tolerance system has been on my mind. At the very least I think I'll implement the flammable group as a 1-in-x chance for ignition, so flammable=10 would be 1/10th as likely to catch fire as flammable=1.

[wizardofgcc]

Idea: add a tree that has a similar use to abaca trees that can be processed into coarse fibre. They could be somewhat rare, so that players have a decision between cana that you can farm and gives lots of fibre gradually, and these trees that can give some (coarse) fibre quickly.

[jeremyshannon]

Merged into v4 branch