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/RawHeightMap.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+#include <fstream>
+
+class RawHeightMap {
+public:
+	RawHeightMap();
+	RawHeightMap(std::ifstream& stream, float height, float width);
+	~RawHeightMap();
+
+	uint32_t m_Unknown1;
+	uint32_t m_Unknown2;
+	uint32_t m_Unknown3;
+	uint32_t m_Unknown4;
+
+	float m_ScaleFactor;
+
+	std::vector<float> m_FloatMap = {};
+};