Implement text format for machine patterns

[0xABADCAFE]

Need a simple format for writing machine patterns that can be loaded and parsed into a Sequence / Event structure for playback.

• Should be plain text that is editable in any basic editor
• Syntax should be simple and intuitive to any tracker composer
• Syntax should be terse and avoid characters that require any modifier keys (shift, alt, etc)
• Syntax should be indifferent to whitespace.