Scheduling improvements

[ErikNatanael]

• Adds sample accurate scheduling of parameter changes and the start of Gens. A Gen that is started in the middle of a block
• New timing primitive types based on BillyDMs blog post on the subject
• A Sync and Send interface for communicating with a graph on the audio thread from any other thread. Communication channels can be sprinkled across a project.
• Better support for Graphs within Graphs.
• Triggers.
• Updated examples.
• Many bugfixes.