Setup Biomemap Generator

Release 0.4.0-Preview.1

This release mainly focuses on refining implementations for biomemap generator so it can be integrated into our heightfield generator later.

Biome implementation

• Enhance memory management for STPLayer, remove explicit memory allocation and deletion, instead it's now automatically managed by a new class STPLayerManager.
• Enable loading biome settings from Biome.ini.
• Add biome map storage into STPChunk.
• Reimplement STPBiomeFactory for safe parallel biome map generation.
• Implement biome layer chain for demo purpose.
• Integrate layer implementation supplier into STPBiomeFactory.
• Add linker function in STPHeightfieldGenerator and allow linking STPBiomeFactory with it for biome map generation.
• Add biome map generation options to STPHeightfieldGenerator, however STPHeightfieldGenerator is still not able to generate biome map, integration will yet be implemented until further notice.

Changes

• Remove using in headers to avoid naming conflict.
• Remove mapOffsetY from INI entry.
• Change namespace STPBiome to STPDiversity to resolve naming conflict with class STPBiome.
• Rename some files to make our programming style more consistent, such as from STPBiome_def.h to STPBiomeDefine.h.
• Remove meaningless const qualifier for value return type.
• Implement device pointer deleter, and all device memory are now managed by std::unique_ptr.