Upgrade to thud

Upgrade to thud

Changes include:
- Add LAYERSERIES_COMPAT definitions to layer.conf files
- Disable pulseaudio-module-4a-client for now as it does not compile
  against PulseAudio 12.x
- Remove meta-audio-4a-framework/recipes-devtools/python/python3-websockets_4.0.1.bb
  as it is superseded by upstream
- Add OECMAKE_GENERATOR = "Unix Makefiles" to 4a-alsa-core, 4a-hal-generic,
  4a-hal-unicens, and 4a-softmixer recipes for now to work around CMake+ninja
  issue
- Remove alsa 1.1.6 recipes from meta-audio-4a-framework/recipes-multimedia/alsa
  as they are superseded by upstream.  Local changes to the alsa-plugins
  recipe have been implemented in a bbappend.

Known issues:
- pulseaudio-module-4a-client has been disabled
- CMake+ninja issue in cmake-apps-module has been worked around with
  OECMAKE_GENERATOR

Bug-AGL: SPEC-1837

Change-Id: I5355e9f74e2385a093ca21cda5bd52a80e1a6e67
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>