Blender Git Loki

Bugfix #26736

Operator "New Image" cannot be redone simply, undo system keeps images
around, and each redo will create new block. Removed it from being
registered for redos.

Also: fix up for default operator names to be complete, and not just
"new" or "load". If we want contextual shortening of operator names
(like in Image menu), that should be handled seprately, automatically,
or anything we can sanely come up with that will suit any possible
language as well.