feat(gcode): add wipe_inward and fix wipe_on_loops nozzle position (Orca #15407)

[aceRage]

Description

Port of OrcaSlicer #15407: Wipe inward for external perimeters, plus the bundled wipe_on_loops destination/nozzle-position fixes.

New print settings (default off):

• wipe_inward — offset the external-wall wipe path toward already-printed inner walls
• wipe_inward_distance — mm or % of actual outer-wall width (default 50%)

Falls back to the regular wipe when there is no adjacent inner wall yet (single-wall areas, Outer/Inner order) or no supported inward path. Forced off for PA and retraction calibrations.

Output change for existing Wipe on loop profiles (mandatory re-slice)

This PR intentionally changes G-code for existing profiles with Wipe on loop (wipe_on_loops) enabled, even when Wipe inward (wipe_inward) remains disabled.

The loop move samples the incoming and outgoing extrusion paths by distance across path boundaries. The stored nozzle position is also updated after that move (set_last_pos), so subsequent travel and wiping start from the position the nozzle actually reached. These corrections can change the loop move and the following travel/wipe paths for existing configurations.

When testing with Wipe on loop enabled, please re-slice representative models and re-check seam appearance and wipe paths, including with Wipe inward disabled.

Screenshots/Recordings/Graphs

See upstream OrcaSlicer #15407 for printed before/after photos. This is a code port; no EdgeSlicer printer validation yet.

Tests

• tests/libslic3r/test_wipe_path.cpp — geometry helpers (offset, support, loop destination)
• tests/fff_print/test_wipe.cpp — G-code wipe trajectories, including wipe_on_loops + set_last_pos with wipe_inward off

Not touched: CoolingBuffer / FanMover / speed smoothing, wipe-tower, MixedFilament, paint-depth.

Draft PR; do not merge until wipe_on_loops profiles are re-sliced and checked.

  

[github-actions]

❌ Documentation validation failed

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[aceRage]

Status update (Sep 20): marked ready for review. Branch is up to date with main, mergeable (clean), and "Check Documentation" CI is green.

Port fixes applied on top of the original port:

• comExpert → comAdvanced (no expert tier in this fork)
• private Polyline::reset_to_linear_move() replaced with public fitting_result manipulation
• Point3 → 2D Point appends (ExtrusionPath::polyline is 2D here)
• calibration-suppression test: dropped Calib_PA_Line from the generate-list — upstream tests Calib_Auto_PA_Line (drawn on the object); this fork's legacy Calib_PA_Line replaces the print with the pure calibration pattern, so there is nothing to suppress

Catch2 results on this branch (Windows, Release):

• [WipePath]: 277 assertions / 47 cases ✓
• [Wipe]: 1318 assertions / 15 cases ✓

Remaining gate before merge: re-slice representative wipe_on_loops profiles and check seam/wipe paths with wipe_inward off and on (this PR intentionally changes G-code for existing wipe_on_loops profiles). A combined test build (this PR + #51 + main) is installed in the maintainer's live-testing folder.