Fix some issues reported by lintian

Fix some issues reported by lintian

• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Remove obsolete fields Contact, Name from debian/upstream/metadata (already present in machine-readable debian/copyright).
• Fix field name cases in debian/control (VCS-Browser => Vcs-Browser, VCS-Git => Vcs-Git). (cute-field)
• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Remove obsolete fields Contact, Name from debian/upstream/metadata (already present in machine-readable debian/copyright).
• Fix field name cases in debian/control (VCS-Browser ⇒ Vcs-Browser, VCS-Git ⇒ Vcs-Git). (cute-field)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/9c/5ae679d611a77d5f31595a76763edafb52af72.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/37/d9557c30bc626bd2a310ba515eb6cbc2187e1d.debug

Control files of package inform6-compiler: lines which differ (wdiff format)

• Homepage: [-http​://inform-fiction.org/-] {+https​://inform-fiction.org/+}

Control files of package inform6-compiler-dbgsym: lines which differ (wdiff format)

• Build-Ids: 37d9557c30bc626bd2a310ba515eb6cbc2187e1d 9c5ae679d611a77d5f31595a76763edafb52af72

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Build and test logs for this branch can be found at https://janitor.debian.net/run/115186dc-cc38-48b5-b746-2fa6ed200949.