Release 2.1.5

## Version **2.1.5** is a <em style=color:red>beta</em> release

There has been lots of refactoring, and some quite significant changes under the hood.

  * Primarily this new release is more *relocatable*.

  * It works as a standalone and self-contained PYZ application now.

  * Plugin meta comment blocks are now utilized fully, for initialization and configuration management.

  * A new plugin for Radio-Browser.info and for interfacing with RadioTray was included.

  * The Gtk UI is now queried for more attributes, which allowed the channel tabs to become reorderable in the main window.

  * Images and icons are now embedded into script files.

  * And more failure safe guards have been added.

  * Further improvements to documentation and associated doc files were made.