Make sure SpotStatus stays left-most on the status bar

[skypanther]

I have found the changing SpotStatus text to be distracting once additional system menu icons are added. Not only does the song title / artist text change, but any new menu icons get shifted left/right. This PR aims to keep the SpotStatus menu item as the left most item in the system menu bar.

There is no public API (nor a private one) that I can find that would let you specify a menu order. Since the most-recent item is added on the left, this change removes the SpotStatus item every time the song changes and then re-adds it. I find the result to be far less distracting.

[joshspicer]

(I haven't looked at this repo in a while - sorry!)

I personally keep my SpotStatus pretty far right on the status bar and do like it that way. I think if either you or I add this as an optional setting, that would be a great feature to add.