Port to libpeas-2
From the NEWS
file:
### Reoval of PeasActivatable
Interfaces are cheap and easy to create in GObject these days. Application
developers are encouraged to create their own interfaces or base-objects
which can implemented by their plugins.
### PeasEngine
The PeasEngine object now implements a GListModel of PeasPluginInfo. Now
that PeasPluginInfo is a GObject, you may bind it's properties to labels
within rows of a GtkListView with relative ease.