Allows Windows users to put SDL2 folder in %HIFI_LIB_DIR% folder (see BUILD.md for info about %HIFI_LIB_DIR% environment variable)
removed duplicate hints entries
First headMove "no-barf" version with lean/nod to walk, turn
Moved the new hints to HINTS, thanks for the hint @birarda
Merge pull request #3624 from thoys/sdl2-find-hifi_libs

Allow "%HIFI_LIB_DIR%/SDL2" for SDL2 path on Windows
Merge pull request #3627 from PhilipRosedale/master

First cut, Oculus headMove with warping
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Fix for send delay, delay ordering.