Cleanup unused stuff in mapgen_functions.cpp #72954
Merged
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Summary
None
Purpose of change
Unused code not cool
Describe the solution
Removes rift and hellmouth functions that stopped spawning in #32464.
Removes mapgen_null which as far as I can see can't possibly spawn bc the null id for oter_t is "" not "null", and purposefully doesn't have a map so it triggers an error.
Removes header definitions of mapgen_cave and mapgen_cave_rat that don't exist anymore.
Unhardcodes empty_rock and open_air.
Describe alternatives you've considered
Testing
Game compiles, no relevant errors tping around
Additional context