NavPath::alwaysRender works the same as NavMesh::alwaysRender.
kills off the presence of a fake light when there are no others in a given scene
Adds material definitions for groundcover referencing.
Removed ShapeBase::Thread::sound.

Weird feature that's not script-accessible or actually implemented.
Merge pull request #769 from Azaezel/groundcoverMaterials

Adds material definitions for groundcover referencing.
Merge pull request #773 from eightyeight/remove-thread-sound

Removed ShapeBase::Thread::sound
Merge pull request #754 from Azaezel/zeroLightsMeansZero

requested correction
Merge pull request #717 from eightyeight/navpath-always-render

Make NavPath::alwaysRender work the same as NavMesh::alwaysRender