v4.4.0

New features

• Add Debian (bullseye, bookworm, trixie) to the CI to make sure ALSA UMP and RawMidi support gets tested
• Fix iOS support and add iOS CI (thanks @fwcd !)
• Add compatibility with ni-midi2: the libremidi::ump type will convert automatically from / to midi::universal_packet and it is possible to send directly some ni-midi2 data types through libremidi::midi_out
• Added an example of very basic MIDI-CI interoperation with MIDI2.0Workbench: https://github.com/jcelerier/libremidi/blob/master/examples/midi2_interop.cpp
• Observer: add a track_any flag to track MIDI ports that are not reported as being hardware or software.
• UMP: allow send_ump to handle UMP streams, not only single UMP packets.

Bugfixes

• Fix sysex concatenation on WinMM
• Various MIDI 2-related fixes across the entire stack
• Work-in-progress on RawMidi MIDI2 backend - output should work, input not there yet. Testing and reporting issues highly appreciated!
• Some compatibility bugfixes, better detection of available features in cmake

Other

• Revamp and cleanup the cmake backends in separate files for clarity.