- [x] Replace `version(ver, checksum=None, **kwargs)` signature with
`version(ver, checksum=None, *, sha256=..., ...)` explicitly listing all arguments.
- [x] Fix various issues in packages:
- `tags` instead of `tag`
- `default` instead of `preferred`
- `sha26` instead of `sha256`
- etc
Also, use `sha256=...` consistently.
Note: setting `sha256` currently doesn't validate the checksum length, so you could do
`sha256="a"*32` and it would get checked as `md5`... but that's something for another PR.
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