429: CTD on XP12b8

Implemented macOS notarization.

Workaround for Zibo 737's lack of a fuselage body in the .acf definition

libacfutils update

XP11.50d10 has a bug where it won't update the viewport dataref in Op…

…enGL mode on Linux.

Switched minimum OSX version to 10.9.

Removed throttle lock-down due to incompatibility with JAR A320 and F…

…F 757.

Added proper centripetal acceleration limitation.

Brittany's audio WIP.

Made release version print the version number as the git tag.

Added version number to Preferences window title.

Corrected missing alpha channel in Vienna livery.