Fix T84328: Correct errors caused by renaming

In rBA6aa8e130eff59059886e203ff95221609f63b222 all occurrences
of "lamp" where replaced with "light" which also accidentally
renamed "clamp" to "clight". In case of the x3d importer and
object carver add-on this broke some functionality. This
commit fixes the names to match the use the correct properties
of the Python API and use semantically correct names for other
add-on where the renaming didn't cause functional changes.

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D9782