Bugfix release
- Import Grid from XYZ: wrong 'separator'
- pointcloud_tools/pc_isolated_points_filter: use 3d search engine
- saga_api, clipper: quick fix for clipper2 with some gcc versions
- saga_gdi/3d_view_dialog: stop sequence playing before exiting dialog
Reported by: portscout, Repoloy
MFH: 2023Q2
(cherry picked from commit 6c94859e17)