It is more convenient and structured to use a
map in order to store system actions and their
properties. The current changes are an improvement
over the classic instance properties because
it provides clarity and ease of management.
https://bugzilla.gnome.org/show_bug.cgi?id=691900
In anticipation of showing the system actions in
the search results, it is fit to move action
specific code to its own module in order to
reuse it.
https://bugzilla.gnome.org/show_bug.cgi?id=691900