Allow inverting lake generation, specifying generated lake terrains #83293
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Summary
Infrastructure "Allowing inverting lake generation for islands-style overmaps"
Purpose of change
A conversation I had with Karol1223 about #83275
Describe the solution
Add an optional bool to lake region settings that inverts the noise function. Also add bounds to the lake flood-fill (similar to the ocean flood-fill) to prevent an infinite loop in lake flood-fill.
Also load the bed/surface/shore/interior terrains from region settings.
Testing
Set

invert_lakesto true and generate a world.