Fix some issues reported by lintian

Fix some issues reported by lintian

• 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-dvbviewer/4cc8cd66-ba90-40d7-9e79-023b3e15dd5f.

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/b9/755d0d7306ca43252388aec844ae8afc7ff108.debug

Files in first .changes but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/8b/5fd8dd3c690d4b22daa35541d22a081ac96f94.debug

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

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

• Build-Ids: 8b5fd8dd3c690d4b22daa35541d22a081ac96f94 b9755d0d7306ca43252388aec844ae8afc7ff108

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