v0.16.0

Release 0.16.0 brings in these improvements and changes:

• AUv2: stepped and enum parameters now report a proper
  AudioUnitParameterInfo.unit instead of corrupting the flags bitfield, and
  kAudioUnitProperty_BypassEffect now drives and follows the plugin's CLAP
  bypass parameter (#489).
• macOS: the wrapper's timer is now attached to the main run loop rather than
  the current thread's run loop, so it fires reliably (#494).
• WCLAP: a self-contained single-file .wclap.wasm is built by default, and the
  .wclap/ directory bundle plus its distributable .tar.gz are only produced
  when a resource directory is defined (#495).
• AUv2: full MIDI 1.0 and MIDI 2.0 (UMP) input and output with proper dialect
  negotiation and SysEx support, reaching MIDI parity with the VST3 wrapper
  (#493).
• AUv2: buses are reinitialized after SetNumberOfElements resets the channel
  count, fixing mono aufx configurations in auval and Logic and plugging a
  bus-name string leak (#496).
• AUv2: effects with no audio ports get a silent stereo in/out facade
  (placeholder bus, SupportedNumChannels, ValidFormat) so they pass auval
  (#497).
• AUv2: silence buffers are created as cleared buffers so reconfiguration no
  longer feeds uninitialized memory to buses during validation (#498).
• VST3: parameter values are synced from the CLAP plugin after state load so
  the host reads an up-to-date parameter cache, fixing #475 (#499).
• AUv2: fixed a use-after-free when hosts read parameter clump names during a
  parameter rescan — clump names are returned by value under a mutex, clump
  ids stay stable across rescans, and CopyClumpName/non-UTF-8 name handling
  were corrected (#500).
• AUv3: the GUI-created flag is cleared when the plugin's gui->create() fails,
  so no resize or destroy callbacks reach a GUI that was never created, and
  creation can be retried (#501).