New writer interface
Paragraph collapsing
Update style
No need to override __construct
auto-passing parent / Writer abstract class
Use UnitLeaf for the ends of the tree
Phrase is obsolete
Refactor code
New chord font
Handle song scale
Convert all variables to camelCase for consistency
Change chordExists to hasChords
Allow init functions to cancel elements
TCPDF only accepts TTF, not OTF
Move config to style
Prepare for writers
Helper classes
New syntax
New Writers