Qt4 - Preferences, improve a bit the Hotkeys. Preparatory work to merge the Hotkeys from SPrefs and AdvPrefs.

qt4 - SPrefs: define a caching general value ( Custom, lowest, low, normal, high, highest) that control all the caching values in the preferences for dummies.
Preferences for dummies should now be finished. ref #603

A side effect is that on FreeBSD the console is not filled anymore with "xscreensaver-xxx not found", because "/bin/sh xx 2>&-" will not close stderr if the specified command doesn't exist.

Fix a few FIXMEs.

Don't pop the string before using it (else our pointer points to garbage) and add a user friendly error message in vlclua_stream_new.

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 :/

Remove unneed setting of val.b_bool before calling var_Set( p_input, "rate-{faster,slower}", val ) in the rc module. Those variables are of type VLC_VAR_VOID.

Add a psz_intf member to intf_thread_t. This holds the string given to module_Need to load the interface (which can then be used by the interface to know what name was used to load it).

* we don't need AUTHORS, THANKS, COPYING and README (generic edition) inside our app bundle anymore, as they're either hard-coded or present on the disk-image anyway

* use the hard-coded authors and thanks lists instead of bundled files and incorporate [22938] for trunk

authors: feel free to change to the licence you want, and to add yourself to the Authors list
additionnally, adds break.lua to its Makefile.am

Patch by Brian C. Wiles

circumstances in styled subtitles.