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 The input variable "program-scrambled" will contain the state for the current
program only. If at least one es is scrambled then the whole program is.
 The associated event is INPUT_EVENT_PROGRAM.
 If necessary for a better GUI support, we could change it to a list.

This change is needed to fix teletext support.

(You get to love va_list type-safety)

 This will force people to use VLC_INPUT_OPTION_TRUSTED flag when they
need it and ease security review.
 This commit has no functionnal/security changes.

 The associated libvlc_MediaPlayerBuffering and libvlc_Buffering value could
probably be removed (not done as I do not know the maintainer opinion).

They will allow interfaces to display the current buffering status.

 The associated libvlc_MediaPlayerStopped and libvlc_Stopped value could
probably be removed (not done as I do not know the maintainer opinion).

 It removes the need of INPUT_GET_BYTE_POSITION/INPUT_SET_BYTE_SIZE which where
not thread safe.

 The input event vout now warns about every vout creation/destruction
due to a decoder.

A new variable intf-event has been added.
It supercedes the following variables (they are still present for the
time being):
 - intf-change
 - intf-change-vout
 - rate-change
 - stats-change
and allows to have a better knowledge of the change done.

It is documented in vlc_input.h (in progress).

It fixes a bunch of missing locks and remove unused functions.
It splits input_internal.h

There is no functionnal changes except a few missing events added.

The input core does separate playing states for forward or backward direction from the playing state PLAYING_S. If one wants to know in what direction VLC is playing, then he needs to look at the sign value of the "rate" value. Backward playing direction has a negative "rate" value. Forward playing direction has a positive one.

No functionnal changes yet.

They are set to -1 if not specified.