[Feat] Terrain render

[MrTroble]

Get data from API

Data is passed as float buffer[33*33]

addTerrain(size_t pointSize, float* buffer)

pointSize is the size of the length of the cell in this case 33
buffer is a valid pointer to a float buffer[pointSize*pointSize] buffer that contains the height data

between each data point there is 64 game unites space

https://en.uesp.net/wiki/Skyrim_Mod:Mod_File_Format/LAND

[MrTroble]

@Elscrux

New API for terrains (WIP)

TGE_DLLEXPORT bool addTerrainCallback(TerrainAddCallback callback);

struct TerrainInfo {
   float x; // Local editor space offset
   float y; // Local editor space offset
   ulong point_size; // Length of one cell = 33

   ulong positionBegin; // first index of the positional data in buffer of this cell
   // normal data and color data is passed as 3 floats per point to build the coresponding vec
   ulong normalBegin; // first index of the normal data in buffer of this cell
   ulong colorBegin; // first index of the color data in buffer of this cell

   SETextureSet topLeft;
   SETextureSet bottomLeft;
   SETextureSet topRight;
   SETextureSet bottomRight;
}

TGE_DLLEXPORT bool loadTerrain(uint count, TerrainInfo* info, float* buffer);

[MrTroble]

#if SkyrimSE
struct TextureSet {
  string Diffuse;
  string Normal;
  string Specular;
  string EnvironmentMask;
  string Height;
  string Environment;
  string Multilayer;
  string Emissive;
}
#endif

using BaseLayer = TextureSet;

struct AlphaData{
  float Opacity;
  ushort Position;
}

struct AlphaLayer {
  TextureSet TextureSet;
  AlphaData* Data; // max 289 (pass by pointer) 
  ushort DataLength;
}

struct Quadrant {
  BaseLayer BaseLayer;
  AlphaLayer* AlphaLayers; // max 8 layers (pass by pointer)
  ubyte AlphaLayersLength;
}

struct CornerSets {
  Quadrant TopRight;
  Quadrant BottomRight;
  Quadrant TopLeft;
  Quadrant BottomLeft;
}