feat: Complete plugin lifecycle management with lazy loading and runtime reload

Major changes:
- Add unload() method to all plugins for proper cleanup (unregister commands/providers/LSP clients, destroy widgets, clear state)
- Implement lazy widget loading via "show" signal across all containers
- Add autoload: false manifest option for manual/conditional plugin loading
- Add Plugins UI with runtime load/unload toggle via Ctrl+Shift+p
- Implement controller unregistration system with proper signal disconnection
- Add new events: UnregisterCommandEvent, GetFilesEvent, GetSourceViewsEvent, TogglePluginsUiEvent
- Fix signal leaks by tracking and disconnecting handlers in widgets (search/replace, LSP manager, tabs, telescope, markdown preview)
- Add Save/Save As to tabs context menu
- Improve search/replace behavior (selection handling, focus management)
- Add telescope file initialization from existing loaded files
- Refactor plugin reload watcher to dynamically add/remove plugins on filesystem changes
- Add new plugins: file_history, extend_source_view_menu, godot_lsp_client
- Fix bug in prettify_json (undefined variable reference

src/libs/event_factory.py

@@ -36,6 +36,19 @@ class EventFactory(Singleton):
 
         logger.debug(f"Registered {i} event types:")
 
+    def unregister_events(self, events: dict):
+        i = 0
+        for name, obj in events:
+            if not self._is_valid_event_class(obj): continue
+
+            event_type = self._class_name_to_event_type(name)
+
+            del self._event_classes[event_type]
+            Code_Event_Types.remove_event_class(name)
+            i += 1
+
+        logger.debug(f"Unregistered {i} event types:")
+
     def create_event(self, event_type: str, **kwargs) -> BaseEvent:
         if event_type not in self._event_classes:
             raise ValueError(f"Unknown event type: {event_type}")
@@ -80,6 +93,9 @@ class EventNamespace:
     def add_event_class(self, name: str, event_class: Type[BaseEvent]):
         setattr(self, name, event_class)
 
+    def remove_event_class(self, name: str):
+        delattr(self, name)
+
 
 
 Code_Event_Types = EventNamespace()