Sprint groups

[fluxusfrequency]

What's this PR do?

• Makes it possible to adjust team strength on a per-sprint basis
• Moves the responsibility of chunking items into sprints from ItemColumn into SprintGroup

  Any background context or notes you want to provide?

Needs styling

Which code should the reviewer start with?

app/views/components/item-column/sprint-group.js Note that chunkItems has been refactored from the way it worked in ItemColumn (lodash each) to a while loop. Added velocity adjustments and deal with sprints where team strength is 0%.

How is this feature tested (either manually or automatically)?

Adjust the team strength of sprints in the backlog.

What are the relevant tickets (please include link(s))?

https://sprint.ly/product/1/item/9919

Screenshots (if appropriate)

What gif best describes this PR or how it makes you feel?

Definition of Done:

• [X] Is there appropriate test coverage?

[fluxusfrequency]

Updated styles from master, but needs further styling:

[fluxusfrequency]

Per our conversation in Slack, it looks like I misunderstood what you want. I'll move the team strength input form into a popover.

[fluxusfrequency]

@wookiehangover Got the TS adjustment into the popover, as we talked about. Open to more styling tweaks if you have any ideas.

[wookiehangover]

Wunderbar!

[fluxusfrequency]

Is that a candy bar?

[fluxusfrequency]

Schönen Dank

[wookiehangover]

Clicking on the background of the popover opens and closes the sprint. We should stopPropagation there.