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

plugins/code/event-watchers/file_state_watcher/watcher_checks.py

@@ -10,23 +10,23 @@ from libs.event_factory import Event_Factory, Code_Event_Types
 
 
 
-def file_is_deleted(event):
+def file_is_deleted(event, emit):
     event.file.was_deleted = True
     event = Event_Factory.create_event(
         "file_externally_deleted",
         file   = event.file,
         buffer = event.buffer
     )
-    self.emit(event)
+    emit(event)
 
 
-def file_is_externally_modified(event):
+def file_is_externally_modified(event, emit):
 #    event = Event_Factory.create_event(
 #        "file_externally_modified",
 #        file   = event.file,
 #        buffer = event.buffer
 #    )
-#    self.emit(event)
+#    emit(event)
 
     ...