Add missing files

regen

Add missing types for gtk-3.24.10+

Add convenience constructor for native file chooser

Add array-based convenience intialisers

s/label group: SListProtocol/group: SListProtocol

Add PKG_CONFIG_PATH for libffi

Prefix Gdk constants to avoid ambiguity prior to Swift 4.2

Make this compile under Ubuntu 18.04

Make this compile with Swift 4