This PR introduces a machine object and a machine library, along with a
new machine editor dialog for creating and editing *.fcm machine asset
files. The editor is integrated into the CAM preferences panel, with new
Python modules for the dialog and minimal model validation. Machine
management (add, edit, delete) is now available in the CAM asset
preferences panel.
Key Features:
- Machines now have a type and units property. The machine type can be
used to distinguish between different classes of machines (e.g., mill,
lathe, laser).
- Machine units are stored internally and in the .fcm JSON file as
metric. Note: This differs from how toolbits work (which store units in
their native units)
- Support for 2-5 axis machines.
- Support for multiple spindles (up to 9)
- Processor defaults
- JSON Text Editor with basic validation and line numbers.
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