adds Log class
brings Log class into stable state
silences warning about deprecated conversion of string literal to char*
works around GLUT bugs related to monospace glyphs
Merge branch 'master' of git://github.com/worklist/hifi into 19262
integrates logging
removes leftover #include
Merge branch 'master' of git://github.com/worklist/hifi into 19262

Conflicts:
	interface/src/Util.cpp
brings logging component to stable state
reduces default character size
integrates logging for interface
integrates logging for 'shared' library
adds optional LogStream for cpp iostream-style logging
fixes misplaced include .h -> .cpp
Merge branch 'master' of git://github.com/worklist/hifi into 19262
adds logging support to voxels library
integrates logging for 'avatars' library, fixes missig return in Log.cpp, adds _lib suffix for log callback namespaces and reverts voxels -> voxLib rename in main
Stars turned back on by default - lemme know if anyone sees problems.
Added a translucent ground plane, and made a few more grid lines.  Easier to see when 'standing' on.
Updated Orientation class to use Philip's technique.
- Changed Orientation class to use Philip's technique for determining vectors
- updated main.cpp to take command line option to run Orientation tests
- tweaked eulerToOrthonormals() to return right vector instead of left vector