Provide plugin architecture so developers can register bundles for editing/displaying field types.

Provide a plugins folder where developers can drop in a bundle for a component that can edit a field type - editor should support single or list of values. This would allow indy devs to add mapping components for postgis or master detail editors or styled text editors or whatever...

Start by locating the editor and field-type handling code, then review how the repository is structured around the proposed plugins folder. Define what plugin registration must support for editors of single values and lists, including the examples named in the issue; done means developers can add such bundles without changing the core editor.

Written by the indexing model from the issue text.