gtk: gtkgesturestylus: implemented `anydev` property

this allows setting a Gtk.GestureStylus to a state, where it can be
used to handle non-stylus devices (e.g. mice).
This might be useful for applications that handle stylus input, but
want to allow falling back to a mice, if the user is unable to provide
stylus input.
12 jobs for stylanydev in 11 minutes and 46 seconds (queued for 1 second)