ENH: CLI: support multi-extruder slicing

1. add slicing errors for gcode in unprintable area, also for filament mapping
2. use common area for auto arrange
3. support filament_map/filament_map_mode related params
4. add logic to check the filament maps before slicing
5. uptodate support multi-extruder
6. switch new machine/filament support multi-extruder
7. process config params support transfer between mult-extruder and
   single-extruder
8. improve machine-limit logic support multi-extruder
9. flush-volume support multi-extruder
10. add default params to support auto mapping slicing

jira: no-jira
Change-Id: Ice39a365841322ddb586d39c56ff923626822528
(cherry picked from commit f518d6804a9de69deef81c20cd22005a4bbd0cd4)

src/libslic3r/BuildVolume.cpp

@@ -148,6 +148,8 @@ BuildVolume::BuildVolume(const std::vector<Vec2d> &printable_area, const double
                     extruder_volume.bboxf = m_bboxf;
                     extruder_volume.circle = m_circle;
                 }
+                //always ignore z
+                extruder_volume.bboxf.min.z() = -std::numeric_limits<double>::max();
                 m_extruder_volumes.push_back(std::move(extruder_volume));
             }