Removed hardcoded global_id "player" (#359)

* Removed hardcoded global_id "player"
Removed hardcoded node name "start_position"

* docs: Automatic update of API docs

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

game/rooms/room01/room01.tscn

@@ -143,6 +143,7 @@ __meta__ = {
 position = Vector2( 653.761, 443.306 )
 script = ExtResource( 7 )
 global_id = "r1_start"
+is_start_location = true
 
 [node name="destination_point" type="Position2D" parent="."]
 position = Vector2( 476.984, 487.146 )