Drawer objects draw on other images or directly on forms.
When initializing a Drawer object, the image is passed as one of the arguments.
Unlike the built-in drawing methods in Basic4ppc, when drawing on forms using Drawer
the changes will only appear after refreshing the form.
Drawer includes two Refresh methods which allow refreshing a part of the form.
Drawer also includes transparent support.
For better performance it is better to make all the drawings and only then refresh the
form.