New spice inputs for New.pm

New spice inputs for description, source domain, and template group. Option to create a relevancy block.

Connected changes in the spice repo - https://github.com/duckduckgo/zeroclickinfo-spice/pull/1034
@DavidMascio Can you style this as:

```perl
my %vars = (
    ia_name => $name,
    ia_desc => $desc,
    ...
);
```

I think it's easier to read if it wasn't just on one line. :)