Biome configuration redo Part 1

Resetting all Eras and Eternity to a base to work with. This stage is incomplete as all extra biomes are disabled in all Eras at this point.

Stronghold and village generation settings will be consistent across all Eras and Eternity, but of course not all the biomes will be present in each era. They also happen to be the defaults.

Prototypes for Tesseral and Wasteland terrain gen will be present as part of this pass.
Biome Pass Part 2: Primordial

Primordial is being given an "about to come out of the Ice Age" feel here.

Note the neat Polar Nether biome is made much more common in this Era (and only this Era!).
Biome Pass Part 3: Antiquity

Antiquity will be wild and jungly!

...Or wilder and junglier. Thanks, Vanilla. >_>
Fixing oversights in Primordial configs
Biome Pass Part 4: Medieval

Medieval will be unusually swampy!
Biome Pass Part 5: Discovery

Discovery will have a disproportionate amount of forests and plain "odd" biomes to come across!
Biome Pass Part 6: Mechanized

This era has much more common plains, canyons and ravines to reflect the fact that the world is being mass-mined by this stage.
Biome Pass Part 7: Information

A "half-step" in time compared to all the other Eras, this marks the "present day" and the turning point where history can wander one way or the other.

Flickers of both Tesseral and Wasteland gen are mixed in with a tweaked Mechanized worldgen.

Origin Valley biomes are unusually common in this period as attempts to avert environmental disaster are generating these biomes as experiments.
Biome Pass Part 8: Tesseral

Tesseral is an odd mix of minimal forests and maximal gardens and pleasing-to-the-eye mountain features, after an extensive biosphere restoration effort.

One price paid though is a permanently higher volume of water in the world.

It bears little resemblance to the past Eras on purpose.
Biome Pass Part 9: Wasteland

THIS IS A PROTOTYPE TO SEED THE CONCEPT.

tl;dr: Environmental collapse.
River generation correction

Prior to Mechanized, Dry Rivers will not be generated.
Lush and Dry Rivers can show up in Mechanized.
Information only spawns Dry Rivers.
Tesseral spawns Lush Rivers.
Wasteland spawns Dry Rivers.
Renaming Mechanized Era config folder

It's the only one not named after its official name because we changed it, so I've fixed that.