Added category add/remove (no recolour/rename for now)

lib/providers/source_provider.dart

@@ -47,6 +47,7 @@ class App {
   late Map<String, String> additionalSettings;
   late DateTime? lastUpdateCheck;
   bool pinned = false;
+  String? category;
   App(
       this.id,
       this.url,
@@ -58,7 +59,8 @@ class App {
       this.preferredApkIndex,
       this.additionalSettings,
       this.lastUpdateCheck,
-      this.pinned);
+      this.pinned,
+      {this.category});
 
   @override
   String toString() {
@@ -107,7 +109,8 @@ class App {
         json['lastUpdateCheck'] == null
             ? null
             : DateTime.fromMicrosecondsSinceEpoch(json['lastUpdateCheck']),
-        json['pinned'] ?? false);
+        json['pinned'] ?? false,
+        category: json['category']);
   }
 
   Map<String, dynamic> toJson() => {
@@ -121,7 +124,8 @@ class App {
         'preferredApkIndex': preferredApkIndex,
         'additionalSettings': jsonEncode(additionalSettings),
         'lastUpdateCheck': lastUpdateCheck?.microsecondsSinceEpoch,
-        'pinned': pinned
+        'pinned': pinned,
+        'category': category
       };
 }