Magic Enum v0.6.2

Release v0.6.2

• Fix cvref regression, fix #16.

• Add documentation.

• Improve enum_value for dense enums.

• Add check if the enum is a forward declaration or valid enum_range::max and enum_range::min, fix #15.

• Add macro MAGIC_ENUM_SUPPORTED to check compiler support.

• Caching enum_values, enum_names, enum_entries.

• Remove is_fixed_enum.