Add tests around write-entity! function
- [X] A command to 'sync from trello' the current entity without its structure
- [X] Use C-u on sync-entity-to-trello command to trigger the sync-entity-from-trello
Improve clarity using alias constant to symbol t.
Refactor - rename write* function to the buffer namespace
Refactor - rename internal function to a more explicit name + update docstring
Intermediary commit