Stable release v0.8.0

See current README.md for complete docs. This release includes:

• Complete support for required glTF 2.0 schema elements
• Modern C++14/C++17 support
• Small, header-only library
• Fast, Efficient, and Safe processing

Furthermore, a proof-of-concept DX12 viewer is in the works and has demonstrated true end-to-end usage of the API and data buffer handling implementation.