FamiStudio 3.1.1 Hotfix

A small hotfix release was just published.

• Fixed piano roll piano keys not highlighting when exporting video
• Fixed application stalling when closing on MacOS
• Fixed "advanced properties" buttons growing when using >100% scaling on Windows
• Adding failsafe when time signature cannot be computed when exporting MIDI
• Associating FMS files with FamiStudio on startup in portable mode
• Experimental support for OpenH264 in video export