Pligins refactor with new context and controller integration

src/plugins/plugins_controller_mixin.py

@@ -0,0 +1,19 @@
+# Python imports
+
+# Lib imports
+
+# Application imports
+
+
+
+
+class PluginsControllerMixin:
+
+    def requests_ui_element(self, target_id: str):
+        builder   = settings_manager.get_builder()
+        ui_target = builder.get_object(target_id)
+
+        if not ui_target:
+            raise InvalidPluginException('Unknown "target_id" given in requests.')
+
+        return ui_target