Fix xcode project paths
Add vmath functions to find and split octants
Cleanup lwc normalisation code
Additional useful constants
Make lwcoord use a long for integer part
Add mf4 zxz rot matrix function.
Add cubemapping header to vmath umbrella header

Also adds tests for cubemapping functions.
Add functions mf4_mul3 and md3_zxz_rotmatrix
Fix long3 type to only have 3 elements
Remove old constants
Fix 32 bit issue with lwc normalisation

Large world coordinates where not properly normalized when the offset exceeded
INT_MAX.