(core) Reference and ReferenceList formatters

Summary:
Previously, ref/reflist columns were formatted entirely based on their visible column, since they received values from the visible or display columns rather than the actual row IDs. This creates `ReferenceFormatter` and `ReferenceListFormatter` which still delegate most of the formatting work to a visible column formatter but fix a few issues:

- ReferenceList columns now actually use the options (e.g. date format) of the visible column to format their elements. Previously they were formatted generically because the visible column formatter wasn't expecting a list.
- Invalid references aren't formatted with an `#Invalid Ref` prefix.
- When the ref column displays the Row ID, it doesn't have a visible or display column. Previously this led to the references being formatted as just numbers in most cases, with special code in the widget to display them like `Table1[2]`. Now they are consistently formatted in that style throughout.

Test Plan: Updated existing tests.

Reviewers: jarek

Reviewed By: jarek

Subscribers: dsagal

Differential Revision: https://phab.getgrist.com/D3212

app/client/widgets/ChoiceTextBox.ts

@@ -49,7 +49,7 @@ export class ChoiceTextBox extends NTextBox {
         dom.domComputed((use) => {
           if (this.isDisposed() || use(row._isAddRow)) { return null; }
 
-          const formattedValue = use(this.valueFormatter).format(use(value));
+          const formattedValue = use(this.valueFormatter).formatAny(use(value));
           if (formattedValue === '') { return null; }
 
           const choiceOptions = use(this._choiceOptionsByName).get(formattedValue);