Cmdtools-py

- Fix error not handled in command struct by HugeBrain16

- add `NotFoundError` custom exception by HugeBrain16

- Fix recursion error in command extension by HugeBrain16

What's Changed
* Rewrite cmdtools v3.x by HugeBrain16 in https://github.com/HugeBrain16/cmdtools/pull/4


**Full Changelog**: https://github.com/HugeBrain16/cmdtools/compare/2.5.0...3.0.0-dev0

Changes from commit

- removed `AioCmd` class by HugeBrain16 [3b174fa](https://github.com/HugeBrain16/cmdtools/commit/3b174faef6ada243ab4823d98b2eae91ed1d6b18)
- change run method to sync HugeBrain16 [6865df7](https://github.com/HugeBrain16/cmdtools/commit/6865df7db65f900ae4ccc20537d071d8545628f5)

**Full Changelog**: https://github.com/HugeBrain16/cmdtools/compare/2.4.9...2.5.0

Changes from commit

- use `__` prefix and suffix for aliases property by hugebrain16 [fd5df39](https://github.com/HugeBrain16/cmdtools/commit/fd5df392c59ffec7898278b01cbc4ba9e680d380)
- use default args instead of using Arbitrary Keyword Argument by hugebrain16 [02c9d8f](https://github.com/HugeBrain16/cmdtools/commit/02c9d8fa7b4c7d207df0c30cb8e056f6fd327ec0)