unified tooltips as dictionary (#8)

## Changes
- From one variable for each tooltip to dictionary
- Should not break the game.

## How to test
- Run game
- In `cocina_delante` every tooltip yould appear as always.
- The rest of the rooms/items appear without tooltip.

## Side effects
- `set_tooltip` ESC command doesn't work untill `tooltip` is set to the in the new way. It changes the tooltip to every object without the new tooltip.
- Should be gone when we update every object.

Reviewed-on: gymkhana/gymkhana#8
Co-authored-by: oier <oierbravo@gmail.com>
Co-committed-by: oier <oierbravo@gmail.com>

gymkhana/items/inventory/caja_herramientas.tscn

@@ -15,10 +15,12 @@ esc_script = "res://gymkhana/items/inventory/caja_herramientas.esc"
 combine_when_selected_action_is_in = [ "action4" ]
 inventory_texture = ExtResource( 2 )
 dialog_color = Color( 1, 1, 1, 1 )
-action1_text = "¿Que es esto?"
-action2_text = "Coger"
-action3_text = "Mirar dentro"
-action4_text = "Usar"
+tooltips = {
+    "action1": "¿Que es esto?",
+    "action2": "Coger",
+    "action3": "Mirar dentro",
+    "action4": "Usar"
+}
 action3_target_texts = {
 "wrench": "Guardarla en la caja"
 }