Eradication of `data` arg to requests. We no longer need to pass this
value around as we have a) type inference, b) nested object insertion
via `put` and `append`.
Fix `joinPath` numeric type coercion
Detect empty string params and treat them as blank with expectParams()
Fix error logging/stack trace printing.
Update Zmpl - includes debug tokens + error tracing to source template
in debug builds.
Remove need to add all mail template params to view response data. This
was originally intended functionality but the wrong value was passed to
the `deliver` function, and no `data` argument was given, making it
cumbersome to create new values.
Create mailers with `jetzig generate mailer <name>`. Mailers define
default values for email fields (e.g. subject, from address, etc.).
Mailers use Zmpl for rendering text/HTML parts.
Send an email from a request with `request.mail()`. Call
`deliver(.background, .{})` on the return value to use the built-in
mail job to send the email asynchronously.
Improve query/HTTP request body param parsing - unescape `+` and `%XX`
characters.
