emms-mark: Overhaul and turn into a derived mode

Make emms-mark integrate better with the rest of EMMS by turning it
into a derived mode of emms-playlist-mode.  This allows it to have its
own keymap derived from emms-playlist-mode, and be easily enabled and
disabled without messing up the output from emms-show.

It will operate on a buffer-by-buffer basis, but can easily be made
the default playlist mode if desired.

We have to avoid calling emms-playlist-mode a second time when
starting emms-mark-mode, so that the selection does not disappear.
Thus, it must be its own function, rather than using
define-derived-mode.

darcs-hash:20070129091833-1bfb2-2a879719548db4b2b8a0f143d6cb2f1ace4419ce.gz

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