• Fix plugin codec issue (#138): 'gbk' codec can't decode byte 0x82 in position 590: illegal multibyte sequence
• Project src may be relative path based on project path
• Refine plugin and document it in details: https://pyarmor.readthedocs.io/en/v5.7.2/how-to-do.html#how-to-deal-with-plugins
• Add common option --debug for pyarmor to show more information in the console
• Project commands, for examples build, cofig, the last argument supports any valid project configuration file