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Add a lot of missing files

There was almost no commonality. This also simplifies stuff a bit.

It will allow to sanetize aout_instance_t.

Move cryptography specific functions into their own file, together with
functions downloading public key / signatures
Factorize common code for generating signatures (hash_sha1_from_*)
Remove unused update_WaitDownload (was OSX specific)

I don't know if this is really useful. On Linux it is not really useful
given the libtool versioning algorithm (VER:REV:AGE -> VER-AGE:AGE:REV)
ensures different sonames in any case.

This reverts commit 17eb17c5.

These functions can be used by HTTP clients to authenticate against
HTTP servers using the Basic and Digest algorithms as described in
RFC2617.

Most of the code is taken from modules/access/http.c, although it
includes modifications to make it work as library functions and to
fix some issues. The HTTP access module can be converted at a
later point, but there's still some stuff needing cleanup first.

These functions will be used for the Remote Audio Output Protocol
plugin to authenticate VLC against RAOP-compatible devices if the
user enabled password protection.
Signed-off-by: Michael Hanselmann <public@hansmi.ch>
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

It will be used to create multiple video from one without having to fake
a video output (and all its overhead).

It introduces a bunch of VLC_CODEC_* defines as a representative
fourcc for a codec. The fourccs have been chosen pretty much randomly
except when I knew well know ones.

It adds two helpers: vlc_fourcc_GetCodec and vlc_fourcc_GetDescription.

Don't hesitate if you have any comments.

This was clearly a bug, as it is documented as an internal function,
and sues internal types

avcodec is used from at least three different plugins: avcodec,
switcher (which seems dead though) and indirectly in avformat. We need
to have a common interlock for all of these.

One useless thread gone (the new subsystem does not need a thread).