(core) Improving experience when editing group-by column.

Summary:
Improving experience when editing group-by column:
- Disable column rename
- Allow changing most widget properties:
 - Color/Background
 - Number format
 - Date/DateTime format (but not the timezone)
 - All toggle options (for toggle column)
- Remove Edit button on Choice Edit
- Changing the underlying column should reset all those options back to the original column.

Test Plan: nbrowser

Reviewers: alexmojaki

Reviewed By: alexmojaki

Subscribers: alexmojaki

Differential Revision: https://phab.getgrist.com/D3216

app/client/widgets/DateTimeTextBox.js

@@ -66,7 +66,10 @@ DateTimeTextBox.prototype.buildConfigDom = function(isTransformConfig) {
   var self = this;
   return dom('div',
     cssLabel("Timezone"),
-    cssRow(gdom.create(buildTZAutocomplete, moment, fromKo(this._timezone), this._setTimezone)),
+    cssRow(
+      gdom.create(buildTZAutocomplete, moment, fromKo(this._timezone), this._setTimezone,
+        { disabled : fromKo(this.field.column().disableEditData)}),
+      ),
     self.buildDateConfigDom(),
     cssLabel("Time Format"),
     cssRow(dom(select(fromKo(self.standardTimeFormat), self.timeFormatOptions), dom.testId("Widget_timeFormat"))),