Add option to update executionType on all steps and TestCase at same time.

[Nyaran]

There is one option called "Apply To All Steps" on the Test Case GUI. Could setTestCaseExecutionType function include this option whenever there is update on executiontype, it also able to alter all steps execution_type by enable this "Apply To All Steps" option?

Originally posted by @kengsenghor in #3 (comment)

To study to create helpful functions in future versions