Features:
    - Multiple soundfont support. (enable in settings)

Tweaks:
    - Lightened muted colors in day mode, darkened in night mode
    - Selected effects show up green instead of that milky grey color.
    - All text inputs require a confirmation to take. Otherwise will revert on unfocus.
    - 'Remove Channel' button now using starburst icon rather than circle in percussion channels.

BugFixes:
    - Tempo input field kept forcing a decimal
    - Muting/Unmuting a line didn't update effect line colors
    - 'Undo' actions weren't always reflected in context menus
