Support SATySFi 0.1.x

[na4zagin3]

Here's the package system implemented in SATySFi 0.1.x: https://github.com/gfngfn/SATySFi/wiki/SATySFi-v0.1.z-%E3%81%AE%E3%83%A9%E3%82%A4%E3%83%96%E3%83%A9%E3%83%AA%E3%83%AB%E3%83%BC%E3%83%88%E3%81%A7%E3%81%AE%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E9%85%8D%E7%BD%AE%E3%81%AE%E8%A8%AD%E8%A8%88%E6%A1%88

ToDo:

• Feedback on the design
• Experimental implementation on Satyrographos
• (if possible) Contribute to SATySFi