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>

addons/escoria-ui-simplemouse/tooltip/target_tooltip.tscn

@@ -1,7 +1,7 @@
 [gd_scene load_steps=5 format=2]
 
 [ext_resource path="res://addons/escoria-core/game/assets/fonts/onesize/ONESIZE_.TTF" type="DynamicFontData" id=1]
-[ext_resource path="res://game/ui/ui_mouse_icons/tooltip/tooltip_target.gd" type="Script" id=2]
+[ext_resource path="res://addons/escoria-ui-simplemouse/tooltip/tooltip_target.gd" type="Script" id=2]
 
 [sub_resource type="DynamicFont" id=1]
 size = 30