dashingsoft/pyarmor v5.9.5 on GitHub

Change the plugin search policy, do not support enviorment variable PYARMOR_PLUGIN, but search folder plugins in the pyarmor package path.
Add a new path plugins in the package source, there are several common
plugins. So it's easy to check internet time by this way
```
    pyarmor obfuscate --plugin check_ntp_time foo.py
```
Before that both of these lines should be inserted into foo.py
```
    # {PyArmor Plugins}
    # PyArmor Plugin: check_ntp_time()
```
Fix pack bug: pyi-makespec: error: unrecognized arguments: -y if extra options are passed
Document command pack in details: https://pyarmor.readthedocs.io/en/latest/man.html#pack

dashingsoft/pyarmor v5.9.5 Release 5.9.5 on GitHub