Select / deselect all meta fields

[doekenorg]

This PR resolves #146

Once merged this should be ported to the v2 feed version of the plugin.

• [x] Select all / Deselect all checkbox on meta
• [x] Enable / Disable all fields on sortable fields
• [x] Translate Enable all / Disable all in javascript using json blob
• [x] Fix styling of the buttons via inline to force look in lite & pro

[rafaehlers]

• [x] The Date Updated meta doesn't appear on the Forms > Settings > GravityExport Lite > Default Enabled Meta Fields

• [x] But it does appear already pre-added on the specific form settings:

Everything else looks good and working fine 👍

[zackkatz]

@doekenorg Can you please resolve the merge conflicts?

[doekenorg]

@zackkatz haha, easier said than done, because the base is completely different now. But I got it working!