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This improves readability a lot and prevent us from reinventing the wheel.

Move lua{intf,playlist,meta} to lua/{intf,playlist,meta}. I haven't been able to check the changes to the Win32 and Mac OS X specific Makefile.am parts.

Missing some cases that I could not test.
Also ffmpeg/chroma.c is locked, so I can but leave it broken.
Fix is for the remaining modules is obvious and the issue is easy to detect.

Fix problem with the search lua wrapper (it always returned the "category" playlist even when searching in "onelevel" mode).
Remove debug prints from the rc.lua module.

Add services discovery support and enhance playlist support for lua interface modules. Added "search", "sort" and "sd" commands to rc.lua. Restored true playlist functionality and sd selection in the lua http intf.

 * share/luaintf/http.lua: Equivalent of the legacy modules/control/http/
   module. (The new module takes 272 lines of Lua, instead of 5475 lines for
   the old one.) Functionality is basically the same except for CGI support
   which is missing.
 * share/http-lua/: The HTML files using the new <?vlc [lua code] ?> syntax.
 * modules/misc/lua/: Add Lua bindings for a few VLC function, the most
   important being the HTTPd high level functions, ACLs, stat and opendir.

The Lua code still needs to be cleaned up a bit.

   * Add vlc.license()
   * vlc.vlm.execute_command() now returns the VLC error code and the corresponding error message as 2nd and 3rd return values.
 * share/luaintf: add help and module description related stuff to the telnet and rc modules.

Two things led me to add this new type of Lua modules:
 * Most interfaces duplicate code from one another (rc and telnet both deal
   with sockets, rc and hotkeys duplicate VLC interfacing code)
 * It's easier to code in Lua than in C (for high level stuff)
(* Users can code their own module easily, all they need is a text editor.)

Most of the changes in modules/misc/ are Lua wrappers for different C APIs
in VLC. I'd say that 90% of those wrappers won't change, the other 10% might
 need small changes (mostly to simplify the C code).

The VLC Lua "interface" module will look for lua scripts in the
*share*/luaintf/ directory. Files in *share*/luaintf/modules/ are lua modules
which can be used by multiple VLC Lua modules (using require "modulename").

This commit includes 4 Lua interface modules:
 * dummy.lua: the default module. Prints error messages and quits.
 * rc.lua: equivalent to the legacy rc.c module. Also includes a bunch of
   new features (+ multiple socket connections at a time work!). See file for
   more details.
 * telnet.lua: equivalent to the legacy telnet.c module. See file for more
   details.
 * hotkeys.lua: a rewrite of the hotkey handling module. This module is still
   experimental. I'll need to change VLC core hotkeys stuff to make it work
   like I want (ie: 1 hotkey triggers 1 action instead of the current 1 action
   can have 1 hotkey). This version executes 3 dummy actions when keys 'q',
   'w' or 'x' are pressed.

What's left to do:
 * Port the http interface plugin to this framework (at least for the
   macros/rpn part ... using <?vlc some lua code ?> à la PHP would be way
   easier than what we currently have).
 * Finish work on the hotkeys module.
 * Code a real telnet/rc module with autocompletion and all the cool features
   usually found in a telnet/terminal interface.
 * Trash the legacy C modules.

Stuff to test (which I can't test myself):
 * Win32 and Mac OS X specific changes to Makefile.am
 * Console interface under Win32. I expect it not to work.

Other stuff included in this changeset are:
 * Code cleanup (I'm sure that it's still possible to simplify some of the old lua bindings code).
 * That's pretty much it in fact :/