NoteBlockLib 2.1.3

Changelog v2.1.3

• Don't mutate custom instrument list in SongResampler#applyNbsTempoChangers

Changelog v2.1.2

• Added MinecraftDefinitions#applyExtendedNotesResourcePack
• Use a separate thread for each SongPlayer
• Fixed SongView#getLength returning last tick instead of length
• Added minecraft sound names to Instrument enum
• Made some methods protected to allow subclasses access to internal state