Update project changes test to test a project change that should actually emit a change event. Clicking on blocks should not emit a project changed event.

Adds unit tests for this HOC.

Forcing the playhead onto its own painting layer removes an expensive composite with the waveform. Animate using transforms instead of left prevents layouts of the rest of the page while playing a sound.

This should have happened a long time ago, but the Fastly config prevented it

Queue up messages to send ot the cloud server which accumulate before 
the connection is ready. Add tests for new/updated functionality.