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
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
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Use different unused variable warning suppressor for GCC.