Store locally the list of conversations

lib/utils/list_utils.dart

@@ -0,0 +1,14 @@
+/// List utilities
+///
+/// @author Pierre HUBERT
+
+/// Transform a list of string into something else
+List<int> stringListToIntList(List<String> srcList){
+  List<int> list = List();
+
+  srcList.forEach((e){
+    list.add(int.parse(e));
+  });
+
+  return list;
+}