Fixes
```../hl2sdk-sdk2013/public/tier1/utlblockmemory.h:141:2: error: there are no arguments to ‘swap’ that depend on a template parameter, so a declaration of ‘swap’ must be available [-fpermissive]
141 | swap( m_nBlocks, mem.m_nBlocks );
| ^~~~```
* Fixed a variety of server browser issues with mods based on this SDK
* Fixed many warnings on various platforms
* Added source code for fgdlib and raytrace
* Updated many source files with the latest shared source from TF2.
OSX:
* Added support for Xcode 4.6
* Switched OSX builds to use Xcode instead of makefiles
* Moved libs from src/lib/osx32 to src/lib/public/osx32 or src/lib/common/osx32 to match windows better.
Linux:
* Moved libs from src/lib/linux32 to src/lib/public/linux32 or src/lib/common/linux32 to match windows better.
