Add Irradiance Cache headers to mcintegrator.h
Add #define M_SQRT3  1.73205080756887729353 to mathOptimizations.h to use for Irradiance Cache
Add Irradiance Cache headers to 'yafraycore' include folder
Moved down the 'private' class statement and change this part of code to 'protected'
for fix issue with the last builds.
Auto-note: is the better way??
Add Photon Mapping IC headers (photonic.h)
Add fix for MSVC++ 2008 build issues with "int64_t": typedef long long int64_t;