coretasks: .blocks hostmask -> .blocks host

[dgw]

Description

Tin. Simple subcommand rename w/variables changed to match.

These are not, and AFAICT never have been, actual hostmasks. Having the subcommand name and code variables refer to them as (host)masks has been a point of confusion for, literally, years.

This is just the first step toward making the ignore/block system work more intuitively, but you know what they say about journeys of a thousand miles…

Checklist

• I have read CONTRIBUTING.md
• I can and do license this contribution under the EFLv2
• No issues are reported by make qa (runs make quality and make test)
• I have tested the functionality of the things this change touches
  • Successfully verified listing "host" blocks, adding one (and made sure it actually ignored my test user), and then removing it.

Notes

For full context, thought processes, tentative future plans, and so on: See #1355.

That covers a lot of ground, and most of it is rightly left for the next release (again) so we can try to ship 8.0 this year. But this is a simple patch that makes room for some of those improvements, and didn't take much work to write. Hopefully it won't take much work to review, either. 😁

IMPORTANT

Assuming this is merged, https://sopel.chat/usage/ignoring-people/ needs an update for when 8.0 goes live.