Summary:
- Add ACLColumnList widget for a list of column IDs.
- Replace autocomplete widgets with simpler dropdowns.
- Add select dropdown for the Attribute of UserAttribute rules.
- Switch formula to use ACE editor.
- Factor out customized completion logic from AceEditor.js into a separate file.
- Implement completions for ACL formulas.
- Collect ACL UI files in app/client/aclui
Test Plan: Updated test case, some behavior (like formula autocomplete) only tested manually.
Reviewers: paulfitz
Reviewed By: paulfitz
Differential Revision: https://phab.getgrist.com/D2697
