- implicit documents are now auto-closed when rendered unused, in general, a LOT better document closing behavior

- made history ignore file loading and undo/redo calls instead of having hard-coded ignore on the actions, this will probably save a lot of hair

- fixed: LDObject methods still used operator delete directly, causing *a very frustrating* crash to debug

History should now behave properly..

- corrected history behavior. LDObject::clone() is now off-limits, createCopy() must be used instead. LDObject::deleteSelf() must be used to delete LDObjects (destructor is protected now)

- fixed: cones with 3 digit numbers wouldn't go to the "Cones (48)" category properly

- LDEmpty now overrides getTypeName properly

- changed source file extension from .cpp to .cc

- LDObject::move is no longer virtual

- fixed: LDMatrixObject's position would be an invalid pointer if it was created with the default constructor, causing a crash

- Reworked primitive listing. No longer uses multi-threading.

- LDFile renamed to LDDocument, file.h -> document.h

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