Commands: fix wrapped_command_method, add test for commands with/without args/return

Yury Matveevrequested to merge
fix_commands_no_args into develop

Closes #690 (closed)

It is mush easier/universal to just use *args, **kwargs in the method wrapped_command_method signature, since we do not change agruments at al

Also added test for commands with different signatures

Edited by Yury Matveev

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