We would like to add support for adding/overriding
actions in the editor for a particular mime-type
by registering them in a particular folder in the
System Filesystem (namely
Editors/<mime-type>/Actions).
This is required in order to implement the
bookmarks saving (issue 8007) cleanly as a
bookmarks submodule of the editor. The bookmarks
submodule will then depend on the Projects API
while the editor module will not have to.

The registered actions will be required to
implement javax.swing.Action interface.
Generally the registered actions should be named
(i.e. have the Action.NAME property populated) so
that can be bound to a keystroke by their name.
The actions will be added to the present editor
actions (for the particular mime-type) after the
default actions have been added. If some of the
registered actions will have the same name as the
already present actions then the registered
actions will override the default ones.