feat: reset/override state and instant refresh (#1)

Global settings page:
- Add "Reset to developer defaults" page action (deletes the global
  record) with a destructive confirmation dialog
- Disable the form with a "Create override" callout whenever no global
  record exists, previewing the developer defaults
- List channels that have their own settings when no global record
  exists, noting the new global settings will not apply to them

Channel settings page:
- Add reset page action labeled "Reset to global settings" or
  "Reset to developer defaults" depending on whether global settings
  exist, with a destructive confirmation dialog
- Disable the form with a "Create override" callout when no channel
  record exists; seed the override from the global settings and preview
  the effective (global) values so values do not jump
- Base all form state and callouts on record existence instead of
  serialized-value comparison

Both pages reload via NavigateTo(refetch) after create/reset so the
form and callouts update immediately without a manual browser refresh.

Docs: update the README and Usage Guide admin UI sections accordingly.

Author: roeldeb

.editorconfig

@@ -1,4 +1,4 @@
-# Severity levels of analyzers https://docs.microsoft.com/en-us/visualstudio/code-quality/roslyn-analyzers-overview?view=vs-2019#severity-levels-of-analyzers
+# Severity levels of analyzers https://docs.microsoft.com/en-us/visualstudio/code-quality/roslyn-analyzers-overview?view=vs-2019#severity-levels-of-analyzers
 
 root = true
 

.gitattributes

@@ -1,9 +1,11 @@
 # Auto detect text files and perform LF normalization
 
-# Windows developers can enable autocrlf to checkout in crlf and commit in lf
-# git config --global core.autocrlf true
+# Text files are checked out with LF on every OS, including Windows.
 
-*                   text=auto
+*                   text=auto eol=lf
+
+.gitattributes      text
+.editorconfig       text
 
 *.cs                text diff=csharp
 *.cshtml            text diff=html
@@ -16,6 +18,7 @@
 
 *.xproj             text
 *.props             text
+*.targets           text
 *.filters           text
 *.vcxitems          text
 

README.md

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Threading.Tasks;
 
 using CMS.Activities;

docs/Usage-Guide.md

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;

examples/DancingGoat/AdminComponents/Apps/SampleDataGenerator/SampleDataGeneratorApplication.cs

@@ -1,4 +1,4 @@
-using CMS.Core;
+using CMS.Core;
 
 using Kentico.Xperience.Admin.Base.Forms;
 

examples/DancingGoat/AdminComponents/UIPages/ProductLinkedOnceRule.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Threading.Tasks;
 
 using CMS.ContentEngine;

examples/DancingGoat/AdminComponents/UIPages/ProductLinkedOnceRuleProperties.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;

examples/DancingGoat/AdminComponents/UIPages/UniqueProductSkuValidationRule.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Threading.Tasks;
 
 using CMS.ContentEngine;