exclude_objects: initial implementation

Adding Klipper functionality to support cancelling objects while
printing.

This module keeps track of motion in and out of objects and adjusts
movements as needed.  It also tracks object status and provides that to
clients.

The Klipper module is relatively simple, and only provides one piece of
the workflow. Moonraker already supports processing uploaded files to
insert the required gcode markers for cancelling objects, using
https://github.com/kageurufu/cancelobject-preprocessor. This library is
also available as an executable for use in slicers, and pip
installations also include the script as a callable.

Mainsail has integrated support, and code changes for Fluidd are
available. Support in other interfaces is planned, and we've spoken to
several other developers about integrating frontend support in their
projects.

Signed-off-by: Troy Jacobson <troy.d.jacobson@gmail.com>
Co-authored-by: Franklyn Tackitt <git@frank.af>
Co-authored-by: Eric Callahan <arksine.code@gmail.com>

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