add dispose to files to remove controllers when not used

Frontend/patient_manager/lib/components/popUpMessages/mihDeleteMessage.dart

@@ -196,6 +196,12 @@ class _MIHDeleteMessageState extends State<MIHDeleteMessage> {
     return messageTypes[type];
   }
 
+  @override
+  void dispose() {
+    // TODO: implement dispose
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     var size = MediaQuery.of(context).size;

Frontend/patient_manager/lib/components/popUpMessages/mihErrorMessage.dart

@@ -782,19 +782,11 @@ class _MIHErrorMessageState extends State<MIHErrorMessage> {
     return messageTypes[type];
   }
 
-  // void initialiseSizes() {
-
-  // }
-
-  // @override
-  // void initState() {
-  //   size = MediaQuery.of(context).size;
-  //   setInputError();
-  //   setinvalidCredError();
-  //   setInternetError();
-  //   //initialiseSizes();
-  //   super.initState();
-  // }
+  @override
+  void dispose() {
+    // TODO: implement dispose
+    super.dispose();
+  }
 
   @override
   Widget build(BuildContext context) {

Frontend/patient_manager/lib/components/popUpMessages/mihSuccessMessage.dart

@@ -93,6 +93,12 @@ class _MIHSuccessMessageState extends State<MIHSuccessMessage> {
     return messageTypes[type];
   }
 
+  @override
+  void dispose() {
+    // TODO: implement dispose
+    super.dispose();
+  }
+
   @override
   void initState() {
     message = widget.successMessage;

Frontend/patient_manager/lib/components/popUpMessages/mihWarningMessage.dart

@@ -167,6 +167,12 @@ class _MIHDeleteMessageState extends State<MIHWarningMessage> {
     return messageTypes[type];
   }
 
+  @override
+  void dispose() {
+    // TODO: implement dispose
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     var size = MediaQuery.of(context).size;