Decouple Slicing From Machine Frame Logic (#21)

* minor logic swap

* first attempt, has a race condition

* fixed the offset issue

* found a solution, I think things work now (at least once I quash this race condition)

* still chasing down race conditions

* add manual shear / scale order strategy swap

* tweak manual shear, fix ui uninitialization crash

* fix z height / g-code desync issue

* fix shear then scale cutoff planes

* getting closer

* fix support termination planes

* fix incorrect offsets in shear-then-scale mode

* test - fix overextrusion due to model/layer scale

src/libslic3r/Preset.cpp

@@ -1326,8 +1326,17 @@ static std::vector<std::string> s_Preset_printer_options {
     "belt_shear_y", "belt_shear_y_angle", "belt_shear_y_from", "belt_shear_y_global",
     "belt_shear_z", "belt_shear_z_angle", "belt_shear_z_from", "belt_shear_z_global",
     "belt_scale_x", "belt_scale_x_angle", "belt_scale_y", "belt_scale_y_angle", "belt_scale_z", "belt_scale_z_angle",
+    "belt_mesh_transform_order",
     "preslice_remap_x", "preslice_remap_y", "preslice_remap_z", "preslice_remap_global",
     "gcode_remap_x", "gcode_remap_y", "gcode_remap_z", "gcode_back_transform",
+    "gcode_shear_x", "gcode_shear_x_angle", "gcode_shear_x_from",
+    "gcode_shear_y", "gcode_shear_y_angle", "gcode_shear_y_from",
+    "gcode_shear_z", "gcode_shear_z_angle", "gcode_shear_z_from",
+    "gcode_scale_x", "gcode_scale_x_angle",
+    "gcode_scale_y", "gcode_scale_y_angle",
+    "gcode_scale_z", "gcode_scale_z_angle",
+    "belt_gcode_transform_order",
+    "post_gcode_remap_x", "post_gcode_remap_y", "post_gcode_remap_z",
     "belt_preslice_global",
     "first_layer_plane", "first_layer_plane_offset", "first_layer_plane_thickness",
     "belt_origin_snap_x", "belt_origin_offset_x",