vlc_b64_decode_binary_to_buffer(): i_dst is the size of the destination buffer, not the source buffer

Don't fail launching the video device if a video control failed. Update the hue/saturation/brightness/contrast values in the callback before issue the video control. (I haven't been able to test yet due to lack of hardware)

Factorise the Video Control code. List all available controls in debug messages. Add a callback to update those we already support on the flag (doesn't work properly yet, it might need a restart or something and people on #v4l aren't really helpfull).

Don't compile any of the alsa audio input code if HAVE_ALSA isn't defined. This mainly removes the --v4l2-alsa option if alsa devlopement headers aren't available.

MacOSX/Framework: Minimizes Package Size. only copy the libraries that the vlc modules need. (Patch by Enrique Osuna).

Adds libgcrypt.m4 for systems running autotools without libgcrypt-dev installed
Prefers tabs over spaces in Makefiles