v0.8: Tuple data structure, member_index, and many more

What's Changed

• ARM support (32bit / 64bit)
• Tuple data structure
• member_index utility
• noexcept where possible
• mingw support
• fix hashing for empty strings
• fix mmap move for Windows
• fix serialization of empty vectors

New Contributors

• @sfahnens made their first contribution in #75
• @pablohoch made their first contribution in #81
• @cflaviu made their first contribution in #94
• @julianharbarth made their first contribution in #108

Full Changelog: v0.7...0.8