Release 2.1.23 (72)

New Features:

• Update Highlight to release 4.12.
• Update Boost to release 1.8.5.
• Update Sparkle to release 2.6.3
• Support for Nix Expression Language files (.nix).
• Advanced settings to show about app info on the footer preview.
• Link to buy me a ☕ ( ❤️ )

Bugfix:

• Fixed support for public.xsd UTI.
• Added .ily extension for Lilypond files.