typify the last of mapgen

[PatrikLundell]

Summary

None

Purpose of change

Specify the type of offset and total parameters in mapgen operations.

Describe the solution

Change the type from "point" to "point_rel_omt" for both parameters (and the corresponding ones with the unfortunate "grid" in their names, despite having nothing to do with submaps).

Describe alternatives you've considered

Leave the type of "total" unchanged as it's a dimension specification but not a relative one. Went with typing it as specifying scale was considered more valuable than not indicating a mildly misleading relative feature.

Testing

Compiled and loaded a save. It's all just a consistent type change, so failures should show up on compilation.

Additional context

This was skipped during the typification covering the "m" files as tracking down the actual type required more digging than what was considered warranted at the time. It turned out not that much more digging was required, though.