Tools/MeshExtractor: Fix MeshExtractor getting stuck on Map 571

Increase thread pool queue to allow all tiles to be queued before starting the thread pool.
Fix ".mmap loc" not passing the right coordinates.
Tools/MeshExtractor: Added some more liquid types support (Magma and Slime)
Tools/MeshExtractor: Forgot to remove POLY_AREA_ROAD
Merge pull request #11416 from Nawuko/mmaps_rw-flag

Tools/MeshExtractor: Forgot to remove POLY_AREA_ROAD
Core/Commands: Restore ".mmap path" to use PathGenerator
Tools/MeshExtractor: Allow to extract only 1 tile if specified