#22 Add switch for run in bg

lib/data/res/misc.dart

@@ -1,3 +1,5 @@
+import 'package:flutter/services.dart';
+
 /// RegExp for number
 final numReg = RegExp(r'\s{1,}');
 
@@ -6,3 +8,7 @@ const privateKeyMaxSize = 20 * 1024;
 
 /// Max debug log lines
 const maxDebugLogLines = 100;
+
+/// Method Channels
+const pkgName = 'tech.lolli.toolbox';
+const bgRunChannel = MethodChannel('$pkgName/app_retain');