First round of bug fixes and plugin capability extensions. Creating a preferences tab should no longer require editing Cthulhu itself.

README.md

@@ -29,6 +29,7 @@ toolkit, OpenOffice/LibreOffice, Gecko, WebKitGtk, and KDE Qt toolkit.
 - **Extensible architecture**: Plugin system using pluggy framework
 - **Hot-reloadable plugins**: Add functionality without restarting
 - **Community plugins**: User and system plugin directories
+- **Plugin preferences**: Plugins can provide preferences pages that appear only when the plugin is active
 
 ### Remote Control
 - **D-Bus interface**: External control via D-Bus service
@@ -83,6 +84,13 @@ The `PluginSystemManager` module provides **session-only** plugin control (no pr
 - `SetPluginActive` (parameterized)
 - `RescanPlugins`
 
+### Plugin Preferences Pages
+
+Plugins can add their own Preferences tab without modifying Cthulhu core code.
+Implement `getPreferencesGUI()` to return a Gtk widget (or `(widget, label)`),
+and `getPreferencesFromGUI()` to return a settings dict. The tab appears only
+when the plugin is active.
+
 ### More Documentation
 
 See `README-REMOTE-CONTROLLER.md` and `REMOTE-CONTROLLER-COMMANDS.md` for the full D-Bus API