NEW: Official filament color selection approved

- Add a filament picker dialog for official color selection
- Enable displaying multiple filament colors in the picker dialog and preview sidebar
- Introduce two new config options:
  - `filament_multi_colors`
  - `filament_color_types`
  to both the application config and the 3MF config

jira: STUDIO-12346

Change-Id: I66f8c1ec9147df4f5948c8a329c1737551280e63
(cherry picked from commit 522dc0bbca49033a1ba9725ca7f6c3ea729691a6)

src/libslic3r/PresetBundle.hpp

@@ -355,6 +355,8 @@ private:
     std::pair<PresetsConfigSubstitutions, std::string> load_system_presets_from_json(ForwardCompatibilitySubstitutionRule compatibility_rule);
     // Merge one vendor's presets with the other vendor's presets, report duplicates.
     std::vector<std::string>    merge_presets(PresetBundle &&other);
+    // Update the multicolor information for filaments.
+    void update_filament_multi_color();
     // Update renamed_from and alias maps of system profiles.
     void 						update_system_maps();