(core) New UI for raw data views

Summary:
Creating new UI for raw data views based on design.
- Renaming left for follow up diff
- Link in the menu is hidden for now
To access raw UI, use /p/data URL.

Test Plan: new tests

Reviewers: georgegevoian

Reviewed By: georgegevoian

Subscribers: dsagal

Differential Revision: https://phab.getgrist.com/D3306

app/client/ui2018/modals.ts

@@ -331,6 +331,9 @@ export function cssModalWidth(style: ModalWidth) {
 
 /* CSS styled components */
 
+// For centering, we use 'margin: auto' on the flex item instead of 'justify-content: center' on
+// the flex container, to ensure the full item can be scrolled in case of overflow.
+// See https://stackoverflow.com/a/33455342/328565
 const cssModalDialog = styled('div', `
   background-color: white;
   min-width: 428px;
@@ -377,9 +380,6 @@ export const cssModalButtons = styled('div', `
   }
 `);
 
-// For centering, we use 'margin: auto' on the flex item instead of 'justify-content: center' on
-// the flex container, to ensure the full item can be scrolled in case of overflow.
-// See https://stackoverflow.com/a/33455342/328565
 const cssModalBacker = styled('div', `
   position: fixed;
   display: flex;