Pyarmor

* The command `register` also could register any text file only if it includes registration code in one single line
* Add new option `--buy` for command `register`, which used to open shopping cart of PyArmor: `pyarmor register --buy`

* Fix issue: it raises exception to register a code by Python 2.7

* Support super mode for Python3.9
* Show deprecation warning for `--advanced 1` and `--advanced 3` if super mode is available, use `--advanced 2` and `--advanced 4` instead.
* Both registration code and file are supported by the command `register`

* Fix issue (355): the obfuscated script raises `DeprecationWarning` when getting user data from license file in super mode with Python3.8
* Fix issue (357): Python3.9 doesn't work, the obfuscated scripts raise `unknow opcode 53/88` and segmentation fault

* Fix issue(337): project can't be configured with outer license
* Fix issue(342): in Windows command `pack` doesn't work if the project isn't in the same drive of entry script

* Support binding multiple mac addresses in one machine by format `<Mac1,Mac2,Mac3...>` in Windows and Linux
* For platform `linux.x86_64` and `linux.x86`, the core libraries of super mode for Python2.7 are linked to usc4, the old ones are linked to ucs2
* Fix pack command issue: outer license may not work in some cases
* The platform `linux.armv6` supports super mode