[DvBree]

Description

This change makes texel clip-aware: you can now specify in which clip you want tiles to be generated. A "clip" is a tile in a tilematrix at a higher zoomlevel.

This solves the following issue. If you want to create tiles for a geopackage that is clipped (in the above sense) with a small buffer, then ordinarily texel snap + texel mvt also creates tiles that only lie in this buffer area. This change essentially prevents these undesired buffer tiles from being generated, by not encoding the corresponding geometries in the first place.

To appease the linting gods (function length/complexity), the main function was refactored to make it slightly less unwieldy.

Type of change

• New feature
• Refactoring

Checklist:

• I've double-checked the code in this PR myself
• I've left the code better than before (boy scout rule)
• The code is readable, comments are added that explain hard or non-obvious parts.
• I've expanded/improved the (unit) tests, when applicable
• I've run (unit) tests that prove my solution works
• There's no sensitive information like credentials in my PR