no functional change

This had no relations with the audio input anymore. In particular,
there is no need to reinitialize this when the input is restarted.

I assume this breaks with S/PDIF. And I do not see much use for this.

removed the broken fps display and added a field for EncodedBy

fixes #4710

This ensures that the variables will be available as soon as the aout
is externally visible, and that there value will persist across inputs.

This also saves a bunch of lookup at each new input.

Those variables are inherited and they have no callbacks.

(Lets assume that uintptr_t is big enough, i.e. 32-bits).

 - get the mode string directly from the callback (new) variable value,
 - reduce locking scope,
 - fix read overflow: do not apply peak protection in "max" mode.

split out some functions from Open()
move static functions
sout_stream_id_t -> define struct as empty and use the pointer to store sout_input_t

functional change:
do not force asfh mux if user specified another one but only warn him (like for upd/ts)

makes data smaller:
 no need to store pointers to each item of the array

char *x[] = { "a", "b", "c" };
memory looks like => "a" "b" "c" (&x) &a &b &c

char x[][2] = { "a", "b", "c" };
memory looks like => (&x) "a" "b" "c"

macosx: move VLCFSPanel from VLCControls to VLCMainWindow since its the only class which should know about it

Close #5167