So that we have jp2k support on Windows and MacOS

This wasn't present in the old contribs

shadow and outline must be reset to NULL if the freetype call fails,
so that the same memory is not deallocated twice later on.

make the function static inline
don't compile it at all if we can't compile SSE2

Also no need to keep references to an antique snapshot

refs #3178

We still have the old vlm.html interface, as only batch commands
are in the new lua http interface.
Moving apart its own files gives a clearer view of the two versions.

Old vlm interface was not working because of missing files

This reverts commit 3e6913a3.

The decoder object can be destroyed before libass is and so cannot be
used for logging.

The global one may not be in synch when the callback is called.

It fixes a potential out of bound access.

The global one may not be in synch when the callback is called.

Address a case where we would end up with missing closing underline tags.  This
results in malformed HTML causing the subpicture to never be rendered in those
cases.

Properly the renderer to properly show the inverted exclamation mark, common
in Spanish.

Validated with the WGBH EIA-608 test stream.

It was broken by f9b664ea.

Signed-off-by: Laurent Aimar <fenrir@videolan.org>

This reverts commit 2224fa03.

FT_Done_Glyph seems needed for shadow. More investigation needed to
work out why libfreetype crashes at this FT_Done_Glyph.

shadow refers to outine or glyph. Only these latter ones need deallocation.