Cmdtools-py

- add `AioCmd` instance for `asyncio` support

- update some weird exception message and ignore existing command names or aliases
[f2537484eab7ec22df598d39d0837583b2be1720](https://github.com/HugeBrain16/cmdtools/commit/f2537484eab7ec22df598d39d0837583b2be1720)
- remove unused class property
[7972ab0e898b4ddd01467040e41746f9b5f7d22e](https://github.com/HugeBrain16/cmdtools/commit/7972ab0e898b4ddd01467040e41746f9b5f7d22e)

- command wrapper support for `Command` instance class

- add `CommandWrapper` class

- add aliases for command object

[aeb04f3e59429dd078937263017a8f7eed4f9a0c](https://github.com/HugeBrain16/cmdtools/commit/aeb04f3e59429dd078937263017a8f7eed4f9a0c)
[960fc5a238c3d5394d3b49295c889a505fb7a8d6](https://github.com/HugeBrain16/cmdtools/commit/960fc5a238c3d5394d3b49295c889a505fb7a8d6)
[16dcde46bd01f607f19bf43e47ffb5c78098dba5](https://github.com/HugeBrain16/cmdtools/commit/16dcde46bd01f607f19bf43e47ffb5c78098dba5)