Renaming Mesh to Model
I may use mesh and the d3d_mesh_* namespace for advanced model classes with
extended formats, it is very hard to abstract GM's models.
Networking Systems/Plugin
Made them show up in the enigma settings, default is none for now, I will merge
enigmanet next.
Merge pull request #174 from RobertBColton/master

Rename Mesh to Model, and also make some other frivolous changes that apparently prevent a segmentation fault.