complete quoting of varous Cmake commands, closes #1999
Merge branch 'master' of https://github.com/highfidelity/hifi into cmake-quotes
optionally do not reference OPENGL_INCLUDE_DIR for win
some more string quoting in cmake files
reversing some changes
reversing some changes
Merge pull request #2179 from ey6es/master

Better frame rates on loading by reading cached data from disk in worker thread, render billboards if we haven't loaded the models yet, use voxel LOD parameter to control avatar LODs, too.
Merge pull request #2181 from ZappoMan/bugfixes

particle deadlock and crash fixes a different way
Add sounds for gun, reticle, mouse look firing
Merge pull request #2170 from birarda/cmake-quotes

complete quoting of various cmake commands
Merge pull request #2184 from PhilipRosedale/master

Improved gun with sounds, mouselook firing, damages voxels
Use different unused variable warning suppressor for GCC.