WIP: Add separate tag files for custom Lintian checks. (Closes #934144)

Hi, would someone please test this proposed fix? Thank you!

Lintian now stores tag definitions separately from checks. This commit does that for the custom Lintian profile used in pkg-js-tools.

Moves the tag definitions out of the checks into their own file hierarchy, which is sorted alphabetically. Also adds the check association to each tag definition.