WebGLRenderer: render LineStrip or LinePieces with indexed buffer geometry
Added another exporter that handles Morph Targets

It outputs all the vertices position into morpTargets.
It uses the active time frame
It checks for position, rotation, scale, and modifiers and exports all
vertices positions locally
Merge pull request #4990 from WestLangley/dev-lines

WebGLRenderer: render LineStrip or LinePieces with indexed BufferGeometry
Merge pull request #4992 from mesealexan/dev

Added another exporter for 3D Max that handles Morph Targets
Don't use forinstatement in renderer
Merge pull request #4995 from gero3/geometrygroupsperformance

Don't use forinstatement in renderer
Merge remote-tracking branch 'origin/dev' into removeHackery

Conflicts:
	src/renderers/WebGLRenderer.js
remove comments
fix buffergeometry + remove comments
build it