Magic Enum v0.9.0

Release v0.9.0

• [breaking changes] Remove auto detect enum_range::is_flags. Need to explicitly set enum_range::is_flags, or add define MAGIC_ENUM_AUTO_IS_FLAGS for old behavior.
• Move iostream_operators to magic_enum_iostream.hpp
• Remove MAGIC_ENUM_ENABLE_NONASCII. Now it works by default.
• Add support big range in enum_range. (#268)
• Add fmt support. (#259)
• Add support GCC -fno-pretty-templates. (#258)
• Аdd constexpr containers. (#187)
• Add support R++ builtins for type/enumerator name. (#238)
• Include <functional>. (#252)