Pyarmor

* Fix `get_expired_days` issue, remove decorator `dllmethod`
* Refine output message of `pyarmor -v`

* Add option `-q`, `--silent`, suppress all normal output when running any PyArmor command
* Refine runtime error message, make it clear and more helpful
* Add new function `get_hd_info` in module `pytransform` to get hardware information
* Remove function `get_hd_sn` from module `pytransform`, use `get_hd_info` instead
* Remove useless function `version_info`, `get_trial_days` from module `pytransform`
* Remove attribute `lib_filename` from module `pytransform`, use `_pytransform._name` instead
* Add document https://pyarmor.readthedocs.io/en/latest/pytransform.html
* Refine document https://pyarmor.readthedocs.io/en/latest/security.html

* Export `lib_filename` in the module `pytransform` in order to protect dynamic library `_pytransform`.
Refer to https://pyarmor.readthedocs.io/en/latest/security.html

Thanks to GNU lightning, from this version, the core routines are
protected by JIT technicals. That is to say, there is no binary code
in static file for core routines, they're generated in runtime.

Besides, the pre-built dynamic library for linux arm32/64 are packed
into the source package.

Fixed issues:

* The module `multiprocessing` starts new process failed in obfuscated script:

`AttributeError: '__main__' object has no attribute 'f'`

* Fix backslash issue when running `pack` command with `PyInstaller`
* When PyArmor fails, if `sys.flags.debug` is not set, only print error message, no traceback printed

* Add option `--options` for command `pack`
* For Python 3, there is no new line in the output when `pack` command fails