Add WMS support and measurement functionality

- Implemented WMS layer handling for Slovenian aerial imagery and overlays for cadastral parcels and forest roads.
- Added distance measurement feature allowing users to measure distances on the map with long press interactions.
- Updated localization files for Croatian, Italian, and Slovenian languages to include new measurement and WMS-related strings.
- Enhanced the map layer model to support WMS-specific properties.
- Introduced a new tile provider for debugging WMS requests.
- Updated the drawing toolbar to include measurement mode and clear measurement functionality.
- Integrated SharedPreferences to persist overlay visibility states across app sessions.
- Added utility functions for handling the Slovenian coordinate reference system (EPSG:3794).

lib/l10n/app_localizations_sl.dart

@@ -392,6 +392,29 @@ class AppLocalizationsSl extends AppLocalizations {
   @override
   String get drawRectangleDesc => 'Nariši pravokotno področje na zemljevidu';
 
+  @override
+  String get measureDistance => 'Meri razdaljo';
+
+  @override
+  String get measureDistanceDesc => 'Dolg pritisk na dve točki za merjenje';
+
+  @override
+  String get clearMeasurement => 'Počisti meritev';
+
+  @override
+  String distanceLabel(String distance) {
+    return 'Razdalja: $distance';
+  }
+
+  @override
+  String get longPressForSecondPoint => 'Dolg pritisk za drugo točko';
+
+  @override
+  String get longPressToStartMeasurement => 'Dolg pritisk za prvo točko';
+
+  @override
+  String get longPressToStartNewMeasurement => 'Dolg pritisk za novo meritev';
+
   @override
   String get shareDrawings => 'Deli risbe';
 
@@ -1875,4 +1898,19 @@ class AppLocalizationsSl extends AppLocalizations {
 
   @override
   String get updateLater => 'Kasneje';
+
+  @override
+  String get cadastralParcels => 'Katastrske parcele';
+
+  @override
+  String get forestRoads => 'Gozdne ceste';
+
+  @override
+  String get showCadastralParcels => 'Prikaži katastrske parcele';
+
+  @override
+  String get showForestRoads => 'Prikaži gozdne ceste';
+
+  @override
+  String get wmsOverlays => 'WMS Prekrivanja';
 }