(core) Updating RawData views

Summary:
- Better focus on the widget title
- Adding columns only to the current view section
- New popup with options when user wants to delete a page
- New dialog to enter table name
- New table as a widget doesn't create a separate page
- Removing a table doesn't remove the primary view

Test Plan: Updated and new tests

Reviewers: georgegevoian

Reviewed By: georgegevoian

Differential Revision: https://phab.getgrist.com/D3410

app/client/ui2018/links.ts

@@ -7,7 +7,6 @@ import { dom, IDomArgs, Observable, styled } from 'grainjs';
  * Styling for a simple green <A HREF> link.
  */
 
-// Match the font-weight of buttons.
 export const cssLink = styled('a', `
   color: ${colors.lightGreen};
   --icon-color: ${colors.lightGreen};