KeyframeTrack.trim( start, end ).  Return this if possible.  Use fps in ObjectLoader.  Add KeyframeTrack.scale()

- `AreaLight`: Add to the `ObjectLoader`.

- `DirectionalLight`, `HemisphereLight`, `SpotLight`: Update matrix in
constructor. These lights are not create at origin. The default
constructed Matrix4 is the identity matrix and is out of sync with the
actual position.

- Unit tests

The global cache should be opt-in. #6834

Add more geometries to ObjectLoader.js and pass down missing parameters
to constructors for `CircleGeometry` and `CylinderGeometry`.

- WebGLMultipleRenderers: Use Geometry instead of BufferGeometry
- index.html: add "webgl_multiple_renderers" again
- Misc. fixes to please closure compiler (unused var).

Store reading and writing to `.offsets`.

Avoid mutations to `.drawcalls` from outside the `BufferGeometry`.

For consistency, the `load` call should always be asynchronous, event
when the resource is readily available in cache.

Add unit tests (unittests_three.html only).
Update QUnit to latest version.

Fixes #6779. Does NOT fix #6572.

eg. / e.g.
vertice / vertex
fullframe / full-frame
todo / TODO
unreckognized / unrecognized
ontop / in front
initialise / initialize
unforms / uniforms
overriden / overridden
interpolatation / interpolation
subsurve / sub-curve
Catmull-rom / Catmull-Rom
consruct / construct
colinear / collinear
perpenicular / perpendicular
minimim / minimum
segements / segments
speficied / specified
compatable / compatible
egde / edge
initalization / initialization
shiftet / shifted
childrens' / children's
ambigious / ambiguous
barycoordinates / barycentric coordinates
equi distance / equidistant
equidistance / equidistant
ist / is

And remove one `console.log`