Enable commandline testing of a .ino file

Change to makefile to enable testing
Change to stdio_host to not dump extraneous data
cleaned up stdio_host diagnostic tests
Added test case
Bugfix: Gracefully handle lack of value for attribute in "set"
Enable basic commands in command host
Change default host to the stdio host
Note in test runner that test should now pass
Improved help inside BotHostTiny - introspection hints

Help inside BotHostTiny has now improved and now includes introspection hints.
("help" will be the primary mechanism for the python host to perform discovery)
Help consistency inside CommandHostTiny improved.