(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/checkbox.ts

@@ -34,6 +34,8 @@ export const cssLabel = styled('label', `
   }
 `);
 
+
+
 // TODO: the !important markings are to trump bootstrap, and should be removed when it's gone.
 export const cssCheckboxSquare = styled('input', `
   -webkit-appearance: none;