[PS-1116] Improved network error handling (#2007)

* PS-1116 Improved network error handling on ViewPageViewModel and AddEditPageViewModel

* PS-1116 Renamed ViewPage and AddEditPage pages to a more explicit name.
Refactored CheckPassword from the CipherPages to a single Base class.

* PS-1116 Updated variables relative to the AddEditPage and ViewPage refactor to CipherAddEditPage and CipherDetailPage

* Renamed CipherDetailPage to CipherDetailsPage

* Code improvement

* PS-1116 Improved code formatting

* PS-1116 Improved formatting

* PS-1116 Improved code formatting

src/App/Pages/Vault/GroupingsPage/GroupingsPageViewModel.cs

@@ -378,7 +378,7 @@ namespace Bit.App.Pages
 
         public async Task SelectCipherAsync(CipherView cipher)
         {
-            var page = new ViewPage(cipher.Id);
+            var page = new CipherDetailsPage(cipher.Id);
             await Page.Navigation.PushModalAsync(new NavigationPage(page));
         }