v2.0.0b7 - dict mimicking entries & middleware defaults

Breaking Changes

• entry.pop_field is renamed to entry.pop
• Various changes to default arguments in middleware

Full list of changes

• Fixing sphinx syntax by @tdegeus in #463
• Cleanup docstring by @tdegeus in #462
• Bugfix name split by @tdegeus in #456
• Entry: Dict-mimicking in operator. by @tdegeus in #458
• Rename pop_field -> pop (with default) to make API closer to dict by @tdegeus in #466
• ✨ Add get to mimic dict by @tdegeus in #468
• Adding missing default allow_inplace_modification. Simplifying examples by @tdegeus in #459
• BlockMiddleware: default allow_parallel_execution=True by @tdegeus in #460

Huge thanks to @tdegeus for all his contributions, and for joining the project as a co-maintainer!