Improved GAT parsing speed
Modest improvement to GND loading performance
Map loader performance and actor weapons

- Added weapon table
- It's now possible to add weapon attachment to actors. Still sorting
out motion IDs for different weapon types. Not implemented in client
- Fixed order of tasks in map loader so it doesn't wait for ground model
to be generated before starting to load textures
- Added settings option to use processed textures with alpha channel
(magenta color cleared). This can slice down loading time vastly