Add ZIP-archive support

What does this MR do?

Adds loading and checking of CityGML ZIP-archives in CityDoctor.

Fixes report creation with Features added in version 3.16.0

Related issues

• #12 (closed)
• #104 (closed)

Checklist

• Commits squashed, following the message-template and containing changelog-trailers
• MR title and description are up to date, accurate, and descriptive.
• MR targeting the appropriate branch.
• Latest Merge Result pipeline is green.

requested review from @abeuster and @betzms

assigned to @alexander.riegel

added 6 commits

• 46573e28...ca7fe768 - 5 commits from branch dev
• b75c2602 - Merge branch 'refs/heads/dev' into dev_zip_files

Compare with previous version

marked the checklist item Commits squashed, following the message-template and containing changelog-trailers as completed

marked the checklist item MR targeting the appropriate branch. as completed

marked the checklist item MR title and description are up to date, accurate, and descriptive. as completed

marked the checklist item Latest Merge Result pipeline is green. as completed

mentioned in commit 2459496d

merged