Release 0.75.0

show package name in exception

refactoring; git clone fast; more candidate metadata; multi-line log …

…clarity

document helper functions; re-implement build-parallel

several bug fixes; tag provider improvements; local pypi server impro…

…vements

markers in constraints

graph reduction; multiple markers in linter duplicate detection

doc improvements; constraints in explain and why commands; config set…

…tings as str or list

pre-release resolver error message

fix rewriting requirements with markers; cli commands load from plugins