clim-examples: drawing test cleanup (#537)
clim-examples: drawing test cleanup (#537)

* ignore unsued pane variable
* add *drawing-test-07-rectangle* variable
 * define a new variable to hold the rectangle type so that
  1) it can be changed by user code without recompiling and
  2) we silence the unused code warning that the compiler correctly recognizes if it's a constant local variable.
* add drawing test "03) Polygon Basic"
* indentation and whitespace cleanup
slyrus/mcclim,slyrus/mcclim