Implemented tooltip follows mouse (not perfect).

Fixed bug when using mousewheel action on inventory items.
Added a debug mode for tooltip following mouse

game/rooms/room5/room5.tscn

@@ -77,6 +77,15 @@ text = "ROOM 5"
 
 [node name="walkable_area" type="Navigation2D" parent="."]
 script = ExtResource( 1 )
+scales = null
+bitmaps_scale = Vector2( 1, 1 )
+lightmap = null
+player_speed_multiplier = 1.0
+player_doubleclick_speed_multiplier = 1.5
+lightmap_modulate = Color( 1, 1, 1, 1 )
+debug_mode = 1
+scale_min = 0.3
+scale_max = 1.0
 
 [node name="platform" type="NavigationPolygonInstance" parent="walkable_area"]
 position = Vector2( 6.73163, -264.779 )
@@ -150,7 +159,6 @@ position = Vector2( -77.4207, 0 )
 
 [node name="pen" parent="Hotspots" instance=ExtResource( 10 )]
 position = Vector2( 909.908, 443.451 )
-dialog_color = Color( 1, 1, 1, 1 )
 interact_positions = {
 "default": Vector2( 909.908, 443.451 )
 }