Modify VMAP extractor to give priority to models in patch MPQs.

This fixes VMAPs/MoveMaps in certain locations (e.g. Blackwing Lair).

VMAPs and MoveMaps should be rebuilt completely to ensure that the correct
model data has been used everywhere.
Fix some mmap generating

See cmangos/issues#109

Signed-off-by: Schmoozerd <schmoozerd@scriptdev2.com>