Refactor - Move utils functions inside org-trello-utils.el namespace
- [-] `Checklists don't work for me` - It does work - Need to improve checklist and item predicates. - https://github.com/org-trello/org-trello/issues/204
  - [X] Fix behavior
  - [ ] Fix tests
- [X] `Checklists don't work for me` - It does work - Need to improve checklist and item predicates. - CLOSE https://github.com/org-trello/org-trello/issues/204
  - [X] Fix behavior
  - [X] Fix tests