add new variants of form-on-wing and stay-still#6520

Goober5000 wants to merge 1 commit intoscp-fs2open:masterscp-fs2open/fs2open.github.com:masterfrom

Goober5000:form_on_wing_and_stay_stillGoober5000/fs2open.github.com:form_on_wing_and_stay_stillCopy head branch name to clipboard