v0.3.0-dev3

What's Changed

• Fix reference to undefined variable models by @tmetzl in #173
• Dev by @tmetzl in #174
• Update precommit config by @tmetzl in #176
• Refactor e2xgrader apps by @tmetzl in #177
• Refactor exam submit by @tmetzl in #178
• Hashcode html by @tmetzl in #179
• Fix remove shortcuts by @tmetzl in #180
• Replace this with that in create_header method by @tmetzl in #181
• Use E2xGraderApp instead of outdated Manager in main by @tmetzl in #182

Full Changelog: v0.2.2...v0.3.0-dev3