(core) Adding font options to the style picker

Summary:
Redesigning color picker:
- Single color palette (no light/dark switch)
- Ability to remove color (new empty button)

New font options in the color picker.
Font options are available on:
- Default cell style
- Conditional rules styles
- Choice/ChoiceList editor and token field
- Filters for Choice/ChoiceList columns

Design document:
https://www.figma.com/file/bRTsb47VIOVBfJPj0qF3C9/Grist-Updates?node-id=415%3A8135

Test Plan: new and updated tests

Reviewers: georgegevoian, alexmojaki

Reviewed By: georgegevoian, alexmojaki

Subscribers: alexmojaki

Differential Revision: https://phab.getgrist.com/D3335

app/client/models/DocModel.ts

@@ -36,7 +36,7 @@ import {createValidationRec, ValidationRec} from 'app/client/models/entities/Val
 import {createViewFieldRec, ViewFieldRec} from 'app/client/models/entities/ViewFieldRec';
 import {createViewRec, ViewRec} from 'app/client/models/entities/ViewRec';
 import {createViewSectionRec, ViewSectionRec} from 'app/client/models/entities/ViewSectionRec';
-import {GristObjCode} from 'app/plugin/GristData';
+import {RefListValue} from 'app/common/gristTypes';
 import {decodeObject} from 'app/plugin/objtypes';
 
 // Re-export all the entity types available. The recommended usage is like this:
@@ -97,7 +97,7 @@ export function refRecord<TRow extends MetaRowModel>(
   return ko.pureComputed(() => tableModel.getRowModel(rowIdObs() || 0, true));
 }
 
-type RefListValue = [GristObjCode.List, ...number[]]|null;
+
 /**
  * Returns an observable with a list of records from another table, selected using RefList column.
  * @param {TableModel} tableModel: The model for the table to return a record from.