use hatch instead of setuptools

hatch is the new recommended build system for python packages promoted by the PyPA.

• from user perspective nothing changes (you can use the hatch command now)
• no MANIFEST.in needed anymore (will ship .gitignore in sdist to be able to build wheel, auto-included)
• license-files entry in [project] not needed (will automatically determine common license file names)
• added .git_archival.txt and .gitattributes for git archive install support (correct version determined), solves #99 (closed)

Question

• Do we want more explicit dev versions? (0.4.0rc3.dev566+ga16a6c6 vs 0.4.0rc3.dev566)

changed milestone to %release-0.4

requested review from @mlange

assigned to @muellese

changed the description

added 1 commit

• 088cd0d2 - sdist: no need for changelog there

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marked this merge request as ready

approved this merge request

added 1 commit

• aa508825 - versioning: add archive support

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changed the description

mentioned in issue #98

added infrastructure usability labels

approved this merge request

added 1 commit

• f276ad0b - version: more detailed development versions

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changed the description

changed the description

merged

mentioned in commit 298628d7

mentioned in issue #100 (closed)