Swap button-order on modal dialogs

Issue #4583

- Delete button should be on the right, cancel on the left, for all modal dialogs.
Fix active menu state on settings navigation

closes #4622
- unfocus ActivatingListItem link when clicked
Add support for zip import

fixes #4607

- moves file checks from db and upload API endpoints to api utils
- adds code to accept and then extract a zip and pull out a JSON file
- zip handling requires a lot of dependencies - this needs a good refactor
Merge pull request #4623 from vikhyat/unfocus-nav

Fix active menu state on settings navigation
Merge pull request #4621 from graphiclunarkid/issue4583

Swap button order on deleter-user modal
Merge pull request #4626 from ErisDS/issue-4607

Add support for zip import
Labs page bug fixes

- clear import errors on new attempt
- clear posts and tags from store after delete all
Merge pull request #4630 from ErisDS/labs-bugfixes

Labs page bug fixes