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.

xspf export: write the extension tag before the trackList, we'll need to read it first to handle it properly.

modules/services_discovery/upnp_intel.cpp: Add a todo note: this module needs to be rewritten used the new services discovery API. (this is not really helpful, but yet, that could help to track bugs).

upnp_intel module still has to be rewritten (it will crash at runtime)

Use the services_discovery_GetServicesNames() function in the qt4 and wxwidgets (i don't compile the wxwidgets module so there might be a few warnings/errors). This removes comprehension of how VLC modules work from the interface plugins. This change still needs to be done in the modules/gui/macosx/playlist.m file.

Add argument to module_GetModulesNamesForCapability (and services_discovery_GetServicesNames) to also get the longnames.

Fix module_GetModulesNamesForCapability() and make it handle submodules properly (ie: the shoutcasttv submodule is returned as "shoutcasttv" instead of "shout"). This function (or its services_discovery_GetServicesNames(p_this) specialised version) should be used in interfaces, instead of the current code duplication.

Please report loudly any regression, using spdif or not.

configure.ac: Because of the ld text relocation bug on Mac OS X, we have to disable ffmpeg when using such linker for the time being. Add a big warning at the end of configure if we are in such a configuration.

 * 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.

contrib/ffmpeg-macosx-intel-mmx.patch: Use Graham Booker's patch which works around the ld64 text relocation bug.

* disable ASM support in libtheora for now (until the authors release a fixed version or Apple a fixed ld)