Rest Machining for Path and Path3D Operations

[davidgilkaufman]

WIP, but mostly done. Still TODO:

• make rest machining work with saving (currently it only works using operations that have generated paths since opening the file)
• disable setting debug log level in Path/Op/Area.py
• change UI for enable rest machining instead of multiple modes?
• squash commits
• Bug: path dressups mask the clearedArea property -- look into how those are implemented, and loop through sub operations

Forum thread: https://forum.freecad.org/viewtopic.php?t=78773
Issue: #9756

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[freecadci]

for feature branch PR_9782. Pipeline 903682370 was triggered at 2f826a0. All CI branches and pipelines.

[luzpaz]

Do you mind using git commit --amend and prefixing Path: to both commits titles ?

[luzpaz]

Congrats @davidgilkaufman on your first PR in FreeCAD!