Fix tooltip_node wrong references (#332)

* Created a signal room_ready in ESCMain to notify ESCTooltip that it is ready.
Fixes #302

* docs: Automatic update of API docs

Co-authored-by: StraToN <StraToN@users.noreply.github.com>

docs/api/main.gd.md

@@ -106,4 +106,8 @@ func check_game_scene_methods()
 
 Sanity check that the game.tscn scene's root node script MUST
 implement the following methods. If they do not exist, stop immediately.
-Implement them, even if empty
+Implement them, even if empty
+
+## Signals
+
+- signal room_ready():