Mapgen: Remove unused mgv7 code and some unused biometypes #7164
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The code in the mgv7 boneyard is old mgv7 code, some of it very old from an early version of mgv7, the river code is an early experiment by hmmmm. It's not very useful stuff in my opinion and will still be present in history, no point keeping old code around like this.
Biometypes
This was an old experiment by hmmmm (Dec 2012 before he was a dev 96898c1) that didn't go anywhere
Currently biometype 'normal' is set for all biomes, having alternatives could become useful in future so i have left all code functional but just removed the highly unlikely alternative biometype names.
'Liquid' and 'flat' can both be done by mgflat.
'Nether' and 'aether' are copying MC, nothing wrong with extra realms but we won't be using these names.