* Revised PerspectiveCamera.

- Allows extra skew for stereo rendering.
- Allows to query effective FOV angle (considering .zoom).
- Proper copy / serialization of all properties.
- Tidier, single code path frustum calculation.
- No longer uses ProjectionMatrix.makePerspective.

* Revised PerspectiveCamera physical interface.

* Revert "Fix tga parsing bug of horizontal origin."

This reverts commit 318c4ccf.

* Change TGALoader output from DataTexture with pixels to Texture with canvas

* MMDLoader supports Effect

* Fix typo

See #8428.

* Triangle: new method .closestPointToPoint

* better initialization of variables

* Set renderer to correct resolution when entering VR mode

This ensures that the scene always renders with the best resolution for
the HMD in use. (Will get a 1:1 pixel ratio) For performance reasons
developers may want to render at a lower than recommended resolution. To
do so set VREffect.bufferScale to a lower values (like 0.75).

Will restore the renderer to the previously set resolution when the user
exits VR mode.

* Removed bufferScale from previous VREffect change

* Matrix4: added preMultiply method

* Matri4: preMultiply -> premultiply

* fix bug where gammaInput/gammaOutput were reset by the PMREM generators.

# Conflicts:
#	examples/js/pmrem/PMREMCubeUVPacker.js

* propagate encodings properly between PMREM CubeUVPacker and PMREMGenerator as well as through texture constructors.

# Conflicts:
#	examples/js/pmrem/PMREMCubeUVPacker.js

* turn off tonemapping, fix None HDR map option.

# Conflicts:
#	examples/webgl_materials_envmaps_hdr.html

* minor envmaps_hdr improvements.

# Conflicts:
#	examples/webgl_materials_envmaps_hdr.html

* fix double decode.

* recalc materials when changing texture encodings.

# Conflicts:
#	examples/webgl_materials_envmaps_hdr.html

* clean up envmap_hdr example.

Set to use HAVE_CURRENT_DATA for VideoTexture updates

Greater than or equal to readyState HAVE_CURRENT_DATA

Video texture should check ready state of video to see if current frame is renderable, not if future frames are renderable

Added 2 New SpotLight Examples