Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• Set upstream metadata fields: Bug-Database, Bug-Submit. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)
• Update standards version to 4.6.0, 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 (out-of-date-standards-version)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/cb/71602ba7256d4eded40da8d1b33f3f43054810.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/bc/895fc4cca8642d57f01f927f7d51bf46abfdb4.debug

Control files of package vodovod: lines which differ (wdiff format)

• Depends: libc6 (>= 2.14), 2.34), libgcc-s1 (>= 3.0), libsdl-image1.2 (>= 1.2.10), libsdl-mixer1.2 (>= 1.2.12), libsdl1.2debian (>= 1.2.15), libstdc++6 (>= 11)

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

• Build-Ids: bc895fc4cca8642d57f01f927f7d51bf46abfdb4 cb71602ba7256d4eded40da8d1b33f3f43054810

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/vodovod/5c104add-1910-44ed-970e-7400aa123743.