Franca b03 promotion.
There are a lot of implementations for toString() function for different JavaFX objects:
Node
Color
Point2D
Rectangle2D
MouseEvent
Font
etc
But there is no clear definition of what this function shoul do for these objects.
For expample toString for Color on desktop returns color in rgb format (0-255) and for mobile implementation - in rgb format (0-1.0).

Need to update the API accordingly.