Implement terrain file reading to generate navmeshes in the future (#703)

* Implement terrain file reading to generate navmeshes in the future

* Make Emo's suggested changes.

dNavigation/dTerrain/RawChunk.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <cstdint>
+#include <fstream>
+
+struct RawMesh;
+class RawHeightMap;
+
+class RawChunk {
+public:
+	RawChunk(std::ifstream& stream);
+	~RawChunk();
+
+	void GenerateMesh();
+
+	uint32_t m_ChunkIndex;
+	uint32_t m_Width;
+	uint32_t m_Height;
+	float m_X;
+	float m_Z;
+
+	RawHeightMap* m_HeightMap;
+	RawMesh* m_Mesh;
+};