A Timer will only be created for the analysis task when necessary. This
ensures that the ScopedJuceInitialiser_GUI member inside the
DocumentController is initialised before a Timer instance is even
created.

The ARA SDK's debug functionality is included in the audio_processors
module, hence the configuration had to be moved there from
juce_plugin_client.

This includes Carbon support

These were mistakenly removed in afe5199848

Previously, right-clicking on a slider could change its value, but the
parameter value would not be changed, leaving the slider in a different
state to the parameter.