RingGeometry `s BufferGeometry port

Minor additions to new BufferGeometry

Fix for when maxInstancedCount is 0 at WebGLRenderer

Fix for geometry text pnltri and earcut examples

Updated VRControls and VREffect to support WebVR v1

Based on suggestions by @cvan and @jzitelli

Fix for geometry.maxInstancedCount == 0

Fix for geometry text pnltri example

Fix for geometry text earcut example

Materials: Setting THREE.PremultipliedAlphaBlending as default blending for relevant built-in materials. See #8255.

Fix proposal for issue #8244

New CylinderBufferGeometry

When rendering the the recommended render width and height should be
ignored and viewports should be constructed off of the current
backbuffer’s actual width and height.

Also fixed some compatibility issues with Firefox.

Recent examples cleanup

Revert "Keep TrackballControls from consuming all events."

Improved envmap hdr example

remove unused code from cube_uv_reflection_fragment.

Inline tonemapping: None, Linear, Reinhard and Uncharted2

Premultiplied alpha on materials