v0.5.13

What's Changed

• Grouped property mixins by @PerisicJere in #496
• Changed entity key to tuple by @PerisicJere in #497
• Setters add their own abstract mixins by @PerisicJere in #500
• Revert "Setters add their own abstract mixins" by @PerisicJere in #501

Full Changelog: v0.5.12...v0.5.13