NitrousTracker v0.6.4

New features:

• in fx mode, display a preview cursor for 09XX offset commands

Improvements:

• hide the theme button in settings if DLDI driver fails (asie)
• disable paste button if the clipboard is empty
• reset sample display zoom level when switching samples
• wrap around 'add' value
• updated BlocksDS to 1.21.1

Fixes:

• fix awkward selection drawing logic in pattern editor (asie)
• fix samples with a sample rate below 1191 causing hanging
• fix scroll lock edge case allowing deleted patterns to be played (#249)
• fix sliding on the FX keyboard parameter input
• other minor fixes