editplaycount: You can now edit a song's skipcount using the same dialog.
Added the "Stop Playback" playorder plugin.
Update the documentation to cover updates to songsmenu/editplaycount
Add "Migrate Metadata" Songs Menu plugin
Remove rating patches and unversion the others

The "rating config" patch landed upstream a few versions ago, so I'm
pulling it from this repository.

The "play controls" patch works on several versions, and is really
simple anyway, so I pulled the version number off of it.
Rename the "Stop" plugin to "Stop After Queue"