[MPlayer-dev-eng] [RFC] Potmeter issue

[Ingo Brückl]

This is what I came up with regarding the potmeter issue discussed in
"[PATCH] GUI: Activate potmeter". It still has to be checked with the
existing code and all skins though.

* The item 'potmeter' will be discarded. It will be removed from the skin
  documentation, but still be supported as a depreciated item.

* Instead of 'potmeter', a new item 'pimage' (phase image, same parameters)
  will be introduced.

* Concerning the depreciated 'potmeter' in a skin file:
  ** If there is another related item for the message, it will be handled
     like a pimage.
  ** Not quite sure what to do if there is no other related item for the
     message.

* A new item 'rpotmeter' (rotary potmeter: button, bwidth, bheight, phases,
  numphases, default, X, Y, width, height, message) will be introduced.

Hans-Dieter implements the rendering of rpotmeter (I'll do the rest and
update the documentation) and provides a skin using it (with a tri-state
button; an existing skin may be modified).

Ingo