- added an action for opening the subfiles pointed to by selected references as editable documents

- made select by color/type no longer require uniform selection

- LDObject::Type moved back to global namespace

- removed code rendered unnecessary

- made LDDocument use shared pointers, this eliminates a lot of document-related crashes

- subfile inverting now detects flatness and acts accordingly instead of naively applying invertnext to everything

- simplified parse error handling

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