Maintenance release.

• Fixed the app icon so it scales correctly on the launcher
• Fixed a white outline artifact on the Amiga theme buttons/bezel
• Launcher name corrected to "PocketTracker"
• CLEAN INST no longer clears grooves/tables used only from inside a table row
• Matched track metering between sampler and SoundFont voices
• EQ spectrum accuracy fix on 48 kHz devices
• Large internal code cleanup and small fixes
