Update glade to 3.18.2. Use Python3 instead of Python2.


git-svn-id: svn://creme-brulee.marcuscom.com/ports-experimental/trunk@19525 df743ca5-7f9a-e211-a948-0013205c9059
Update Python GObject stuff to 3.12.1. Use the distinfo file in
pygobject3-common in py[3]-gobject3 instead of replicating it.


git-svn-id: svn://creme-brulee.marcuscom.com/ports-experimental/trunk@19526 df743ca5-7f9a-e211-a948-0013205c9059
Pull in and update gnome-devel-docs to 3.12.1


git-svn-id: svn://creme-brulee.marcuscom.com/ports-experimental/trunk@19527 df743ca5-7f9a-e211-a948-0013205c9059