* CAM: fix G0 regression in drilling
At some point the initial rapid to Safe Height got dropped from drilling cycles.
This leads to excessive air drilling.
It also alters "OLD_Z" which sets the Retraction plane under G98.
The defect is causing much confusion and time wasting in the roadmap discussions
This PR fixes the G0 regression.
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Adds a checkbox to output a G85 cycle used for reaming or boring. The
cycle is like a normal drilling op, but feeds back out of the hole
instead of performing a rapid move.
G85 does not support peck or dwell, so those other options are disabled
when the "Feed retract" option is enabled in the UI.
