Release 4.7.3

A focused patch release for CAM clearing and surfacing controls, workspace import selection, render performance, and slicing memory/stability fixes.

CAM

add a linear roughing clear pattern that runs the outline and fills the interior with routed linear passes
add the linear clear pattern option to Area clear and Trace clear operations
offset linear clear fill lines away from the first perimeter to reduce wall marring
align roughing perimeters to start near the first linear fill line and reduce unnecessary jumps
add slope angle min/max filtering for Area surfacing paths
remove short stranded surfacing segments left behind by slope filtering
fix rough flat detection by ignoring sparse Z-flat levels
improve contour feed limiting so shallow descending moves stay near cutting feed rates instead of dropping to plunge rate
reduce CAM slicer Z bucketing precision to group flatter surfaces more reliably
fix Flip operation Z-bottom inversion so global Z bottom becomes stock.z - zbottom when enabled
fix intermittent trace hover highlighting caused by shared trace materials
add a Makera Z1 CNC machine profile

add a checklist for .kmz workspace imports so users can choose which assets to import
allow imported workspaces to omit workspace objects, machine definitions, process profiles, CNC tools, or application preferences
remember the previous .kmz import asset selections for the next import
fix a worker import error

reduce threaded FDM slicing memory use by restoring cached minion point handling
allow minion sliceZ requests to use cached points or per-request points