Added settings management using QSettings
Fixes asked by ZappoMan on QSettings' commit.
Merge 19358 with upstream Master
We can't initialize avatars from the network thread; they need access to the
OpenGL context.
Merge pull request #486 from ey6es/voxeltars

Fix for glGenBuffers issue.
Merge pull request #478 from Atlante45/master

Settings handling with QSettings
Merge branch 'master' of https://github.com/worklist/hifi into avatardata_optimization