Pyarmor

* Refine decrypted mechanism to improve performance
* Fix unknown opcode problem in recursion call
* Fix wrapper scripts generated by -m in command 'encrypt' doesn't work
* Raise ImportError other than PytransformError when import encrypted module failed

In this version, introduce 2 extra encrypt modes to improve performance of encrypted scripts.

* Fix issue when import encrypted package
* Add encrypted mode 2 and 3 to improve performance
* Refine module pyimcore to improve performance

It's a milestone for Pyarmor, from this version, use ctypes import dynamic library of core functions, other than by python extensions which need to be built with every python version.

Besides, in this version, a big change which make Pyarmor could avoid soure script got by c debugger.

* Use ctypes load core library other than python extentions which need
built for each python version.
* "\__main__" block not running in encrypted script.
* Avoid source code got by c debugger.
* Change default outoupt path to "build" in command "encrypt"
* Change option "--bind" to "--bind-disk" in command "license"
* Document usages in details

[Change Logs](ChangeLog.rst)