Added more Models and developer documentation

What's Changed

• Exclude model client attribute for export and repr by @GrandMoff100 in #65
• Added LogbookEntry model by @GrandMoff100 in #67
• Merge developer for docs. by @GrandMoff100 in #70
• Merge new docs by @GrandMoff100 in #72
• Bug fixes by @GrandMoff100 in #75

Full Changelog: v3.0.0...v3.0.2