Catch plug call mistakes before running

Some plug calls in a phase only failed at run time, on the station, after the operator had started the test.

• Added tofupilot validate warnings for a plug method called with a keyword argument, an await on a plug call, and a property called like a method, each with the corrected call when one exists.
• Improved checks on plug classes defined under an if or a try: misspelled methods, unknown with: keys and misspelled class names are now reported there too.