Rear view zoom level

new zoom icons
save and restore state from settings
display zoomed out rear view when selected
Merge branch 'master' of https://github.com/worklist/hifi into 19447

Conflicts:
	interface/src/ui/RearMirrorTools.cpp
added --getOctalCode to voxel edit
Merge pull request #1146 from ZappoMan/stephens_requests

added --getOctalCode to voxel edit so you can easily make jurisdictions from arbitrary voxels
Normal map support almost there.
Sign change.  Forgot we flip the texture coordinates.
Merge branch 'master' of https://github.com/worklist/hifi into ick
Merge pull request #1141 from stojce/19447

Code Review for Job #19447
Looks like setCentralWidget is ending up calling the init functions in newer
versions of Qt.  Initialize the network access manager before that happens.
Merge pull request #1147 from ey6es/ick

Support for normap maps on loaded models.
Merge pull request #1149 from ey6es/master

This should fix Stephen's crash on init.