Fix WireframeHelper for BufferGeometries without offsets

by just creating a dummy offset
fix coding style
Implemented cross-referencing functions for members
Implemented example cross-referencing from docs
Modified documentation regexes so that link titles can contain spaces and anchors
Add examples of cross-referencing in BufferGeometry
renamed offsets into drawCalls
typo fix
Merge branch 'dev' into crossrefs-docs
AlImprove member cross-linking functions in docs
Example of new cross-referencing in BufferGeometry docs
Merge branch 'dev' into crossrefs-docs
Reformatted docs to add property anchors
Reformatted docs to add method anchors
adds loadingmanager for #4827
SpritePlugin: Add support for .renderDepth. Fixes #5468.
Updated builds.
SpritePlugin: Clean up. Passing renderer instance in the constructor.
SpritePlugin: Only create program when needed.
LensFlarePlugin: Fixed vertexTexture conditional.