Add task numbering in each board

[RARgames]

Add task numbering in each board (so each task has its id: 1, 2, 3, and you can see a small # 1, # 2 somewhere near the task name. It can speed up finding tasks, also added to filter by) In a synchronized board it, clicking task number should open github issue. (Open questions: how to handle issues+PRs?)

[dzek69]

While working on this I suggest to also add an optional ticker code for each board, so while talking with someone I can refer someone to #FRONT-1337 or #FIN-69.

This really helps organize work in a team and I feel a lot of software similar to this lacks this feature unfortunately and to me, and I assume many people is crucial when working in a team.