Added test for backend, enabled_only, visible_only. Changed test test_get_list_of_windows_win32
Added test for backend, enabled_only, visible_only.
Changed test test_get_list_of_windows_win32

drinkertea/pywinauto,airelil/pywinauto,pywinauto/pywinauto,vasily-v-ryabov/pywinauto