which filters out some implementation details but mainly all the
tool-specific options actions which only exist as redirect targets for
the generic tool opaticy, size, aspect and angle actions. Use the new
function from the shortcut editor and from action search so stuff is
consistently hidden.
Fix various bugs, improve code design and efficiency, change feature
name, update the feature up to our standards (now uses GIMP preferences,
session management, less overwhelming settings...).
Also now action history is tightly tied to GimpAction and logs all
action activation (however it activates, and the show_unavailable
parameter also applies to history).
Search algorithm greatly improved with basic tokenization, better
ordering, filtering, etc.
