configure.ac: prepare for 0.19.3
input/Open: expose input_domain
input/AsyncInputStream: set Error when seeking unseekable

Fixes crash in the "audiofile" decoder while logging the seek error.
lib/upnp/ContentDirectoryService: swap uri_apply_base() parameters

When uri_apply_base() was moved from db/upnp/Util.cpp to
util/UriUtil.cpp, the parameter order was changed, however without
swapping the parameters in the ContentDirectoryService constructor.
db/upnp: fix valgrind warning
decoder/ffmpeg: support opus
Merge branch 'v0.19.x'