Custom grouping options for user filament presets (All, None, By Vendor, By Type) (#11681)

* Update PresetComboBoxes.cpp

* add option on preferences

* simplify changes

* update

* Update PresetComboBoxes.cpp

* Update PresetComboBoxes.cpp

* support lowercase on sorting non submenu list

* minor changes

---------

Co-authored-by: Ioannis Giannakas <59056762+igiannakas@users.noreply.github.com>
Co-authored-by: SoftFever <softfeverever@gmail.com>

src/libslic3r/AppConfig.cpp

@@ -318,6 +318,10 @@ void AppConfig::set_defaults()
         set_bool("remember_printer_config", true);
     }
 
+    if (get("group_filament_presets").empty()) {
+        set("group_filament_presets", "1"); // All "0" / None "1" / By Type "2" / By Vendor "3"
+    }
+
     if (get("enable_high_low_temp_mixed_printing").empty()){
         set_bool("enable_high_low_temp_mixed_printing", false);
     }