Project: Starfighter 2.1.1

I found out by sheer chance that version 2.1 introduced a weird bug where after pressing Esc to flee the level early, it would delay doing that until all collectables disappeared, an unintended consequence of the feature that waits to begin the level end sequence until collectables are grabbed. This release fixes this bug, and also updates the copyright dates. Other than that, it's the same as version 2.1.