Created ESCGame class to force game.tscn scene to have empty functions by inheritance.

Also continued some tests about tooltip following mouse.
Fixed project settings wrongly set.

addons/escoria-core/game/core-scripts/escgame.gd

@@ -0,0 +1,108 @@
+tool
+extends Node2D
+class_name ESCGame
+
+func get_class():
+	return "ESCGame"
+
+
+export(float) var mouse_tooltip_margin = 50.0
+
+### EDITOR TOOLS ###
+enum EDITOR_GAME_DEBUG_DISPLAY {
+	NONE, 
+	MOUSE_TOOLTIP_LIMITS
+}
+export(EDITOR_GAME_DEBUG_DISPLAY) var editor_debug_mode = EDITOR_GAME_DEBUG_DISPLAY.NONE setget set_editor_debug_mode
+
+
+
+func set_editor_debug_mode(p_editor_debug_mode : int) -> void:
+	editor_debug_mode = p_editor_debug_mode
+	update()
+
+func _draw():
+	if !Engine.is_editor_hint():
+		return
+	if editor_debug_mode == EDITOR_GAME_DEBUG_DISPLAY.NONE:
+		return
+	
+	if editor_debug_mode == EDITOR_GAME_DEBUG_DISPLAY.MOUSE_TOOLTIP_LIMITS:
+		var mouse_limits : Rect2 = get_viewport_rect().grow(-mouse_tooltip_margin)
+		print(mouse_limits)
+		
+		# Draw lines for tooltip limits
+		draw_rect(mouse_limits, ColorN("red"), false, 10.0)
+	return
+
+
+## BACKGROUND ## 
+func left_click_on_bg(position : Vector2) -> void:
+	pass
+	
+func right_click_on_bg(position : Vector2) -> void:
+	pass
+	
+func left_double_click_on_bg(position : Vector2) -> void:
+	pass
+
+## ITEM/HOTSPOT FOCUS ## 
+func element_focused(element_id : String) -> void:
+	pass
+
+func element_unfocused() -> void:
+	pass
+
+
+## ITEMS ##
+func left_click_on_item(item_global_id : String, event : InputEvent) -> void:
+	pass
+
+func right_click_on_item(item_global_id : String, event : InputEvent) -> void:
+	pass
+
+func left_double_click_on_item(item_global_id : String, event : InputEvent) -> void:
+	pass
+
+
+## INVENTORY ##
+func left_click_on_inventory_item(inventory_item_global_id : String, event : InputEvent) -> void:
+	pass
+
+func right_click_on_inventory_item(inventory_item_global_id : String, event : InputEvent) -> void:
+	pass
+
+func left_double_click_on_inventory_item(inventory_item_global_id : String, event : InputEvent) -> void:
+	pass
+
+func inventory_item_focused(inventory_item_global_id : String) -> void:
+	pass
+	
+func inventory_item_unfocused() -> void:
+	pass
+
+func open_inventory():
+	pass
+
+func close_inventory():
+	pass
+	
+## MOUSEWHEEL ACTION ##
+func mousewheel_action(direction : int):
+	pass
+
+
+## UI SPECIFICS
+func hide_ui():
+	pass
+	
+func show_ui():
+	pass
+
+
+## EVENTS
+func _on_event_done(event_name: String):
+	pass
+
+func _on_tooltip_position_update_required(p_position : Vector2):
+	pass