Improve Vector Maths

Release 0.13.2

Linear algebra library

This release introduce an initial implementations of hand-optimised SIMD linear algebra libraries, STPVector4d and STPMatrix4x4d. Currently it supports:

• Matrix transpose and inverse
• Matrix-matrix and matrix-vector multiplication
• Vector dot product
• Vector broadcast
• Vector addition and division
• Represent an equivalent 3-by-3 matrix

Tests are implemented and the linear algebra library passes all 103 assertions.

The new library is integrated into STPCascadedShadowMap and STPScenePipeline::STPCameraInformation.

General fixes and improvement

• Fulfilling license requirements for all redistributed external projects.
• Improve documentation on build instructions.
• Improve visuals for the project README document.
• Fix a bug in the SuperDemo+ build script which did not copy STPBiomeProperty.hpp to the binary directory to be used by NVRTC.
• Improve build script so it can group headers when opening from an IDE, i.e., MSVC.
• Attempt to group some source files to make it more developer-friendly.

Biome generator in STPBiome

• For simplification, remove the old STPBiome, rename STPBiomeSettings to STPBiome.
• Refactor all biome variable names to avoid using all capital letters (which is supposed to be used by macros).
• Replace use of std::vector with std::array in STPBaseBiomeLayer.
• Change STPBiomeRegistry from class to namespace.
• Make all declarations of functions and variables in STPBiomeRegistry as inline to enforce auto-initialised external linkage.