Don't remove items from the Queue when they've played [done in 1.4]

[philr]

This from Mike in another thread is relevant here.

@mike

I want to briefly address the requests for queue changes we’ve heard from @krutsch and others. The reason you haven’t heard a lot of feedback on these requests isn’t because we refuse to listen or because we’re ignoring the request, but because we ARE listening, we DO desire to do something about it, but we haven’t made a decision as to what and when, so there’s nothing for us to say about it.

We understand this is something that some people care passionately about. Changing how the queue works is a big deal. Whether you agree with the design or think it needs improvement, it is one of the most intensively designed and contentious parts of the system, and broaching the subject means dozens of man-hours spent battling out the design details before a line of code gets written, then a relatively limited amount of development work, followed by a drawn-out QA/alpha testing process–since getting things wrong in the playback system is serious business.

We believe that working on the queue returns less value–both to our users and to our business–per hour invested than many other things we could be working on. We’ve grown the team more than 30% in the last several months, but man hours are still an incredibly precious commodity for a company as small as ours.