Release 0.9.0-Preview.1

Note: You may need to recompile the entire application for this release.

SuperRealism+

We introduce a new build target (or library) dedicated for shading and rendering.

STPShaderManager is a smart GLSL shader object manager that takes source code and compile it with error handling.
STPProgramManager is a GLSL program object manager that takes some shader managers with link and validation error handling.
STPPipelineManager is a GLSL program pipeline object manager that recombines program objects into a new program.

We introduce STPSun as an utility for global light source on the procedural terrain, with STPSunSetting for storing the settings.

STPSun is a physically-based sun position calculator that simulates how the Sun rotates around the Earth in real life with seasonal effects.

Reduce the number of memory operations further in STPWorldPipeline. Now the front rendering buffer is only cleared as per-chunk basis when there is no old buffer to be used instead of clearing the entire buffer at the beginning.
- Also clear buffer is now a pitched device memory rather than a pinned host memory.
Texture anisotropy levels can now be adjusted via Engine.ini instead of being hard-coded in STPWorldManager.
Add a fractal utility in STPSimplexNoise for fast fractal simplex noise generation.
Fix an issue in algorithm device library that causes warning during compilation due to use of non-const in a const function.
Simplify CMake library include and link structure, remove redundant codes.
Rename shared library exports macros for consistency.
Introduce STPNullablePrimitive in the main engine to allow using a primitive type in std::unique_ptr without allocating dynamic memory.
Move terrain normalmap generation to fragment shader for higher level-of-detail and accuracy.
Terrain splatmap genertaion now uses fractal simplex noise instead of a single one.