Move "about osm" to about page, add option to clear tile caches, option to add reason when deleting, min zoom 16 for edits/submissions, 300km nav distance warning

lib/app_state.dart

@@ -581,8 +581,8 @@ class AppState extends ChangeNotifier {
     }
   }
 
-  void deleteNode(OsmNode node) {
-    _uploadQueueState.addFromNodeDeletion(node, uploadMode: uploadMode);
+  void deleteNode(OsmNode node, {String? changesetComment}) {
+    _uploadQueueState.addFromNodeDeletion(node, uploadMode: uploadMode, changesetComment: changesetComment);
     _startUploader();
   }
 
@@ -717,6 +717,11 @@ class AppState extends ChangeNotifier {
     await _settingsState.deleteTileProvider(providerId);
   }
 
+  /// Clear all tile caches for a specific provider
+  Future<void> clearTileProviderCaches(String providerId) async {
+    await _settingsState.clearTileProviderCaches(providerId);
+  }
+
   /// Set follow-me mode
   Future<void> setFollowMeMode(FollowMeMode mode) async {
     await _settingsState.setFollowMeMode(mode);