Apply resyntax lint fixes

Fix arity mismatch nonsense

bug's been bothering me for years now and it's a one line fix

I forgot to commit the typo fix...

implement IRC-bot message integration

fix a use-define oopsies.

also destructure the regex match because "people don't like caadrs winfy".
1984.

List explicit packages in about text

Useful to know what is available in sandboxes

Update readme

Update license and deps in info.rkt

Allow delete_time to be configurable, and document it

discord: If an invocation is deleted within 5 min, r16 also deletes its response

Allow expiring cache to be directly written to

Don't store the value computation lambda but require it to be passed to expiring-cache-get

Fix sort call in rkt search

Show creation date in rkt show

Add rkt search to Discord frontend to search for existing tricks

Fix trick comparison

Fix register/update/delete feedback again

Fix response for register/update/delete on Discord frontend being broken

Make all frontends store trick creation time as integer unix timestamp

Before, this was inconsistent between Discord (iso8601 string timestamp)
and http (unix time in string form).
A script is provided to migrate old files created by the Discord frontend before
this change.

Fix a test

check-false should be separate expressions

Declare some missing deps

Tweaks to http frontend

* Move the module to frontends/http.rkt so the module string the config can be
  "r16/frontends/http"
* Rename the `use-reincludes` parameter to `hotload-templates`
* Write documentation