Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (file-contains-trailing-whitespace)
• Bump debhelper from old 9 to 12. (package-uses-old-debhelper-compat-version)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Set upstream metadata fields: Bug-Database, Bug-Submit. (upstream-metadata-file-is-missing)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/kodi-pvr-vuplus/8d208733-c3e3-49e1-94ce-66f013cdfba4.

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 .changes but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/cc/7b0c50ee5a90aa4b7c40810ede3dcd8cd3fcdc.debug

Files in first .changes but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/7f/826c9da865727b3500a1251dca4fe97b3a1850.debug

No differences were encountered between the control files of package **kodi-pvr-vuplus**

Control files of package kodi-pvr-vuplus-dbgsym: lines which differ (wdiff format)

• Build-Ids: 7f826c9da865727b3500a1251dca4fe97b3a1850 cc7b0c50ee5a90aa4b7c40810ede3dcd8cd3fcdc

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