Refactor - Rename hash-equal to orgtrello-tests/hash-equal
Add a function to ease seeing the buffer's setup
Add function to convert a trello structure to an org-trello structure
Add card containing checklists + checklist containing items use case
- [X] Refactor - Unify data structure between trello card and org-trello card
- [X] Refactor - Improve merge computations
Remove unused constant
- [X] Refactor - Remove some dead code
Doc - Improve docstring and remove useless comment
Compute card's checksum + checksum idempotent
Trigger sync to trello if checksum is different than the current new
computed checksum
Intermediary commit
- [X] Update version
Refactor - Improve log message when action `cancel actions` is done.
Refactor - Improve the meaning of org-get-entry in the context of
opposing card and checkbox
  - [X] 'Sync card to trello' syncs card only if local changes
  - [X] 'Sync card from trello' updates the card from trello and the local checksum signature
  - [X] 'Sync buffer from trello' updates the local card checksum
  - [X] 'Sync buffer to trello' syncs only card with local changes
Refactor - Remove dead code
Refactor - Rename checksum variable
  - [X] 'Delete entity' updates the checksum