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This is not strictly required, but helps propage fix for #1086.

Modules have a psz_help string. This is currently used by 1 module only (headphone audio filter) ... but that doesn't mean that it shouldn't be stored in cache. This commit will break the cache so we need to change a cache version somewhere. Since i didn't know where to look ... this is yet to be done.
+ misc changes

already existed but was only used by modules as far as is know). This
is done in the module_Need function. Needed module names now have this
syntax: '<module>[@<name>]'. If the @<name> part is present, once the
needed module is found it will change p_this->psz_object_name to <name>.
In about 99% of the module_Need calls, p_this is the module's parent
object so this is ok. The remaining calls won't use this syntax so it's
ok i guess :)

* Add new vlc_object_find_name function. It works like vlc_object_find
but uses a string (name) instead of an integer (type) as its second
argument.

* Change the marq, mosaic and logo commands in rc.c. They now take the
target object's name as first argument. Example:

Launch vlc with:
./vlc -I rc --no-audio --sub-filter "marq@test{marquee=Hello}:marq@testouille{marquee=Test}" ~/media/redefined-nintendo.mpg

Then issue the following command to move the second marq:
marq-x testouille 100

(and while testing I fixed #745)

 which weren't used by VLC. This now adds a new b_used flag to module_cache_t which is set to VLC_TRUE once we know that the cached version of the plugin is usable (and thus gets attached to something). If it's not usable, it wont be attached so we tell ModuleDelete() not to try dettaching it.

Fix "object is not attached" error when quiting VLC. (as far as i can tell, it was triggered since memory leak fix in [18247])

The idea is that a given error should be reported only once to the user.
At the moment, for example, we can get:
- "no suitable access module" (printed by module_Need)
 - "unable to create access" (printed by input/access)
 - "unable to open stream" (printed by input/input)
 - ...

The facilities provided here are:
* msg_StackSet( code, message ) : "throw" a new error
* msg_StackAdd( message ) : Append a message allowing to trace the message
* msg_StackMsg() : Retrieve the message

So, in the previous example, module_Need would msg_StackSet( code, "no
suitable access module"), then input/input would add "unable to create
access" and finally, input/input can print the "unable to open stream:
unable to create access: no suitable module" message.

The three functions are context-free, you don't need a vlc_object, so
that we can add verbose error reporting everywhere.

- move vlm to input/
- remove unused libvlc export

* Headers in include must contain the structures and prototypes needed
  by the plugins and should be named vlc_*.
* Headers in include/vlc must contain the structures and prototypes
  needed by external libvlc clients

* Moved and renamed some things in headers. 
   - Removed vlc_cpu.h, vlc_error.h (merged in vlc_common)
   - Removed snapshot.h (merged in vlc_vout.h)
   - Removed vlc_spu.h (merged in vlc_osd.h)
   - Removed intf_eject.h and vlc_interaction.h (merged in vlc_interface)
   - Moved all internal headers to src
   - Merged vlc_video.h and video_output.h and move private things to src
   - Removed vlc/intf.h, vlc/aout.h, vlc/vout.h, vlc/decoder.h and vlc/input.h
     (meta headers for use in modules, and often implying too large 
     dependencies)
* Removed some useless dependencies
* Unexported a bunch of functions and structures used only in src/
  (--> Still some work here)
* Finally made input_thread_t and input_source_t (mostly) private. 
  Added input_GetItem to fetch the input_item of an input_thread
* Cleaned up deprecated entries in vlc_symbols.h and bumped up symbol 
  prefix

This commit has a 99% probability of breaking the build, 0.1% of killing
your cat and 0% of getting you hot chicks.

Might break stuff, but I cannot test much because of DBus vs Win32 breakage(!)

- Fix one more old crasher in the plugin cache loader