CAN should fire a SCRATCHFILE_ADDRESSED event when a note is hashed

When the SCRATCHFILE_PARSED event is fired CAN should hash the notes AST. Once the note has been hashed properly a SCRATCHFILE_ADDRESSED event should be fired with an object { ast: Node, address: Digest } as an argument.

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• When the SCRATCHFILE_PARSED event is fired CAN should hash the AST
  • CAN should fully stringify the AST before creating a digest. CAN should normalise the AST before it is hashed. CAN should fire a SCRATCHFILE_ADDRESSED event when a note is hashed