Add /whois command - old (see #150 for cleaner commits)

[jacklul]

This command will allows to look up basic info about user/group stored in DB.
Chats command will display shortcuts to it instead of id (only if whois is available).

[jacklul]

Additionally optimized this and 'chats' a bit, it's better to just select one row instead of LOTS OF THEM and then iterating over them.

[noplanman]

Cool, I really like this command! 👍
Would be great if /whois @noplanman or equivalent would work too, not only via ID 😊

I also saw that your new /chats command returns the link without a space after the command (e.g. /whois12345 instead of /whois 12345). Is this intentional? Both of those commands work for users though.
For groups it is /whoisg12345 that works, whereas /whois g12345 doesn't.

[jacklul]

I also saw that your new /chats command returns the link without a space after the command (e.g. /whois12345 instead of /whois 12345). Is this intentional?

Yes, so it can be clicked on /chats list.

For groups it is /whoisg12345 that works, whereas /whois g12345 doesn't.

That g is just a replacement for '-' and is only there so the command can be clicked.
/whois g12345 is not supposed to work, use /whois -12345 instead!

Would be great if /whois @noplanman or equivalent would work too, not only via ID

Good idea!

I don't want to spam the repo with so many commits from this PR, just say a word and I'll push all this changes to clean branch and make new PR for this!

[jacklul]

Cleaner branch commit: jacklul@28bd0f9