Added screen to update server

lib/functions/compare_versions.dart

@@ -0,0 +1,47 @@
+bool compareVersions({
+  required String currentVersion, 
+  required String newVersion
+}) {
+  final currentSplit = currentVersion.split('.').map((e) => int.parse(e)).toList();
+  final newSplit = newVersion.split('.').map((e) => int.parse(e)).toList();
+
+  if (newSplit[0] > currentSplit[0]) {
+    return true;
+  }
+  else if (newSplit[1] > currentSplit[1]) {
+    return true;
+  }
+  else if (newSplit[2] > currentSplit[2]) {
+    return true;
+  }   
+  else {
+    return false;
+  }
+}
+
+bool compareBetaVersions({
+  required String currentVersion, 
+  required String newVersion
+}) {
+  final currentSplit = currentVersion.split('-')[0].split('.').map((e) => int.parse(e)).toList();
+  final newSplit = newVersion.split('-')[0].split('.').map((e) => int.parse(e)).toList();
+
+  final currentBeta = int.parse(currentVersion.split('-')[1].replaceAll('b.', ''));
+  final newBeta = int.parse(newVersion.split('-')[1].replaceAll('b.', ''));
+  
+  if (newSplit[0] > currentSplit[0]) {
+    return true;
+  }
+  else if (newSplit[1] > currentSplit[1]) {
+    return true;
+  }
+  else if (newSplit[2] > currentSplit[2]) {
+    return true;
+  }
+  else if (newBeta > currentBeta) {
+    return true;
+  }
+  else {
+    return false;
+  }
+}

lib/functions/open_url.dart

@@ -0,0 +1,17 @@
+import 'package:flutter_web_browser/flutter_web_browser.dart';
+
+void openUrl(String url) {
+  FlutterWebBrowser.openWebPage(
+    url: url,
+    customTabsOptions: const CustomTabsOptions(
+      instantAppsEnabled: true,
+      showTitle: true,
+      urlBarHidingEnabled: false,
+    ),
+    safariVCOptions: const SafariViewControllerOptions(
+      barCollapsingEnabled: true,
+      dismissButtonStyle: SafariViewControllerDismissButtonStyle.close,
+      modalPresentationCapturesStatusBarAppearance: true,
+    )
+  );
+}