Continued work on actions support

[bluesabre]

This PR updates notifications/actions with the following:

• Pulls in the latest changes from master.
• Sets the close revealer alignment (start, start) to make action buttons clickable, otherwise it overlays the entire bubble with an unclickable space.
• Use the actions as specified by the notifications, instead of the DesktopAppInfo actions which may conflict or lead to unexpected opening of the calling application.
• Enables action support for applications without a valid app_info.

[danirabbit]

This all makes sense, gonna go ahead and merge it into the actions branch :)