LIBOPENMPT_ALPHA_WARNING_SEEN_AND_I_KNOW_WHAT_I_AM_DOING is not required anymore

Signed-off-by: Joern Heusipp <osmanx@problemloesungsmaschine.de>
openmpt: Use openmpt_module_read_interleaved_stereo instead of openmpt_module_read_stereo

Signed-off-by: Joern Heusipp <osmanx@problemloesungsmaschine.de>
openmpt: Fix possible memleak when querying metadata

Signed-off-by: Joern Heusipp <osmanx@problemloesungsmaschine.de>
openmptdec: added looping support

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>