NIP-10: kind 1 replies SHOULD be kind 1111

[alexgleason]

Follow up to #2358

Fixes #523

This is a spooky controversial one that we should all switch to kind 1111 for replies to kind 1, treating kind 1 just like any other kind.

Most modern clients already display it. Now Amethyst, Ditto, and the Mostr Bridge produce only kind 1111 replies.

[derekross]

This makes the most sense to me, treating all replies the same.

[arthurfranca]

I support this PR, but not exactly as it's written right now.

I like the idea of using kind:1 events as replies if one wants to publish something similar to a repost, though without creating another branch as a repost would, i.e. keep it as a reply (showing it along with kind:1111 comments) while highlighting it to their follows (showing it on the root events' feed).

Example: I think direct replies to a root kind:1 would be a great fit as a kind:1 event by default, that the user could opt-out from. Opting-out meaning using a kind:1111 event instead.

[arthurfranca]

Changed my mind already. I support this PR as-is.

For the idea I mentioned above, just repost the kind:1111 if user wants it to show up on the root events feed. Less complexity.