added an optional progress callback parameter for "get_offset_model" and "check_for_collisions", since these operations can be very time consuming
fixed the broken logic of the collision check
added a simple cache for derived offset models


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use "rpm" instead of "/minute"


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change keyboard shortcut for toggling the 3d view from CTRL-v to CTRL-Shift-v (otherwise "paste" does not work)


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added x/y offsets to support grid options


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prevent accidental mixing up of different tool/process/bounds settings due to changes of a task setting


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fixed handling of deleted tools/processes/bounds (replace any references or remove tasks if no alternatives are available)


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 * fixes performance issue when using a support grid (previously a new (non-kdtree) trimesh model was created)
implemented a proper update-trigger for kdtree of trimesh model


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