Xvenv

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- smaller fixes
- shell executable cmd-line opt added
- no-dot-args for supporting folder 'venv' instead of '.venv'
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- `-venv` cmd-line parameter in addition to `-cwd` parameter
- `-venv` specifies the venv folder, and
`-cwd` is working directory folder
- pip update after ensurepip added
- BUG fix: bash return code handling
- `tools` uninstall option
- `req` sub-cmd for handling requirements.txt installation
- `pypi` sub-cmd for printing helping information (just for copy&paste as of now)
- `build` clean only for wiping build related folders without starting the building process
- fix in cdvenv
- added run freeze scripts
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- `drop` sub-cmd for removing a venv
- more verbose info
- `binst` sub-cmd for build and installing
- `clean` sub-cmd for wiping build related folders
- `qtest` sub-cmd for running black, flake8, and unit-tests
- better trace / debug log messages
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- first release
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