Added vertex object editing dialog

the header is now also saved

Added a new tool for clamping vertices

removed the old Add History Line tool

Part history can now be edited

Added basic header editing

Fixed crashing

add comments

Header parsing complete, moved all parsing code into a new class. Documents are now all loaded in one go.

begin work on document loading rework

added a document header structure

added signal emissions

moved emit calls

added an MVC interface to the primitives tree

fixed removing objects causing some other objects to disappear

optimized triangle count

fixed: LDDocument created one removal connection to the model for each object added, so removing an object from a model of 9 objects added 9 deletion entries to history

renamed signal

moved LDObject indices from a global array into Model

removed unused code

fixed object deleting not triggering the proper renderer updates

fixed DelHistoryEntries getting ignored...

removed some debug code

Implemented row moving in the model and replaced swapping with it

migrated model swapping to mvc and made Model::swapObjects to emit dataChanged signals as a temporary solution

removed some unneeded headers

Finally removed the cancer that is the LDObject::model pointer

Added LDObject serialization and refactored the internal resource managing to use it. No more tearing objects from one model into another, and this provides a stable way to keep an object's state in memory such as the edit history.

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