Add the ability to spawn 3D models

to get content type

Don't do extra work for float texture support

Performance Optimizations

zone

Don't use A-Frame PolyfillControls helper

The PolyfillControls helper has some breakage where it doesn't
always use the polyfilled VRFrameData class. Also, we don't even
want the pose data to be applied to an Object3D, so it seems a
little bit silly to use.

Performance tweaks

Bump A-Frame to recent master

This was renamed in three.js r93.

Check if browser is an iOS uiWebView

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