A MenuPlugin is a plugin that should appear under the "Plugins" menu.
Note that certain types of plugins automatically appear in certain contexts,
and do not need to implement this interface:
- All ProcessorPlugins appear under the "On-The-Fly Image Processing"
submenu of the Plugins menu (and, when selected, will bring up the
Image Processing Pipeline window).
- All OverlayPlugins appear in the Inspector frame's "Overlays" section.
Currently, adding plugins to menus other than the Plugins menu is not
Indicate which sub-menu of the Plugins menu this plugin should appear
in. If that sub-menu does not exist, it will be created. If an empty
string is returned, then the plugin will be inserted directly into the
Plugins menu, instead of into a sub-menu.
Sub-menu of the Plugins menu hosting this entry
This method will be called when the plugin is selected from the