Remove old submodules
Add new submodules pointing at official alliedmodders repos
Update submodule pointers

+ hl2sdk-csgo is on 'csgo' branch
+ metamod-source is at tag 'mmsource-1.10.0'
Update Makefile

- Fix errors for unused local typedefs when compiling with GCC 4.8
- Update MMSOURCE reference
Merge pull request #2 from kaimallea/master

Use official repos, compile with GCC 4.8