Use image_decoder infrastructure for image decoder
Support annotate + converters shouldn't resize
Recoded video_image in Liquidsoap.

We now have a much cleaner framework for handling images with uniform
metadatas. I had to recode lexing of annotate since a=-1 was lexed as
a/=-/1...
Add Makefile
Merge branch 'master' into image-decoder
This does not hurt under win32 as well (win32 == cross compilation only for us)
Added max parameter to drop data on buffer overrun with input.gstreamer.*
Fix make tarball.
Add image subdir.
Default image to frame width and height.
Restore Genlex.

Use a simple substitution in order to avoid the bad parsing of =-.
Merge branch 'image-decoder'

Conflicts:
	src/decoder/Makefile
	src/io/gstreamer_io.ml