UI: small fixes to audio, remove track from playing list on end
Fix some broken specs
mv lib/manu/entity_mixins to lib/manu/mixins/entity
Add Location equality method (==)
Add id attribute to EventHandler, set where appropriate

Use to keep intended event handler when sanitizing
Small regression fix, retrieve old manu entity ms for comparison
Refactor manu registry into modular mixins

No functional changes beyond this
Fix some broken specs
Split User class in modular mixins

No functional changes
Few comments / scope updates / small regression fixes
Split users registry into separate modules / mixins

No functional changes + users specs should now be functional
again