Hy-1.0a4 compatibility

[umlaeute]

This is an attempt to port the deken cmdline tool to hy-1.0

Closes: #259

TODO:

• [x] package
• [x] upload
• [x] find
• [x] download
  • (downloading multiple times will fail, but this is not a regression))
• [x] verify
  • [x] sha256 verification failed (as a consequence, download etc also fail)
• [x] install
• [x] uninstall
• [x] systeminfo
  • fixed use of match (which has become a reserved token in Py3.10)
• [x] systemfix
  • fixed keyword<->string conversion