v0.6.0

What's Changed

• everestpy refactor by @a-w50 in #85
• Refactor/remove boost any/variant/optional by @a-w50 in #87
• nullptr_t fix by @a-w50 in #88
• Use nlohmann json with multiple headers to allow forward declarations by @hikinggrass in #89
• Log which type file failed by @a-w50 in #90
• Bump version to 0.6.0 by @hikinggrass in #91

Full Changelog: v0.5.0...v0.6.0