Bug#1067589: elpa-dpkg-dev-el: Please improve syntax highlighting of d/copyright

[Niels Thykier <niels@thykier.net>]

Package: elpa-dpkg-dev-el
Version: 37.11
Severity: minor
X-Debbugs-Cc: niels@thykier.net

The `debian-copyright-mode` currently feels a bit lacking when it comes 
to syntax highlighting:

 1) There is a URL highlighting, but it does not cover http**s**. Only
    ftp/http URLs change color. Given most URLs these days are https,
    this feels sub-optimal to me.

 2) There is (almost) no syntax highlighting of the fields at all.
    `Copyright:` as the only thing will be highlighted, but only if
    it is at the start of the line and it is the **only** thing on
    the line. Please highlight other DEP-5 fields and also highlight
    non-empty fields!

Best regards,
Niels