Added On Fire points so that we can track a value in red on the trello c...

...harts.

- Added "on fire" badges which appear in red on the cards.
- Removed the 'automated button click' behaviour so that people can click on multiple numbers before saving their changes.
- Added the point chooser for the On Fire points. In our business, these points will be used to track time remaining or something, whatever our CTO wants to use it for that day.