Add raylib lua examples

examples/models_heightmap.lua

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+-------------------------------------------------------------------------------------------
+--
+--  raylib [models] example - Heightmap loading and drawing
+--
+--  This example has been created using raylib 1.6 (www.raylib.com)
+--  raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+--
+--  Copyright (c) 2014-2016 Ramon Santamaria (@raysan5)
+--
+-------------------------------------------------------------------------------------------
+
+-- Initialization
+-------------------------------------------------------------------------------------------
+local screenWidth = 800
+local screenHeight = 450
+
+InitWindow(screenWidth, screenHeight, "raylib [models] example - heightmap loading and drawing")
+
+-- Define our custom camera to look into our 3d world
+local camera = Camera(Vector3(18.0, 16.0, 18.0), Vector3(0.0, 0.0, 0.0), Vector3(0.0, 1.0, 0.0), 45.0)
+
+local image = LoadImage("resources/heightmap.png")      -- Load heightmap image (RAM)
+local texture = LoadTextureFromImage(image)             -- Convert image to texture (VRAM)
+local map = LoadHeightmap(image, Vector3(16, 8, 16)     -- Load heightmap model with defined size
+map.material.texDiffuse = texture                       -- Set map diffuse texture
+local mapPosition = Vector3(-8.0, 0.0, -8.0)            -- Set model position (depends on model scaling!)
+
+UnloadImage(image)                 -- Unload heightmap image from RAM, already uploaded to VRAM
+
+SetCameraMode(CAMERA.ORBITAL)      -- Set an orbital camera mode
+SetCameraPosition(camera.position) -- Set internal camera position to match our custom camera position
+
+SetTargetFPS(60)                   -- Set our game to run at 60 frames-per-second
+----------------------------------------------------------------------------------------
+
+-- Main game loop
+while not WindowShouldClose() do            -- Detect window close button or ESC key
+    -- Update
+    ---------------------------------------------------------------------------------------
+    UpdateCamera(&camera)          -- Update internal camera and our camera
+    ---------------------------------------------------------------------------------------
+
+    -- Draw
+    ---------------------------------------------------------------------------------------
+    BeginDrawing()
+
+        ClearBackground(RAYWHITE)
+
+        Begin3dMode(camera)
+
+            -- NOTE: Model is scaled to 1/4 of its original size (128x128 units)
+            DrawModel(map, mapPosition, 1.0, RED)
+
+            DrawGrid(20, 1.0)
+
+        End3dMode()
+        
+        DrawTexture(texture, screenWidth - texture.width - 20, 20, WHITE)
+        DrawRectangleLines(screenWidth - texture.width - 20, 20, texture.width, texture.height, GREEN)
+
+        DrawFPS(10, 10)
+
+    EndDrawing()
+    ---------------------------------------------------------------------------------------
+end
+
+-- De-Initialization
+-------------------------------------------------------------------------------------------
+UnloadTexture(texture)     -- Unload texture
+UnloadModel(map)           -- Unload model
+
+CloseWindow()              -- Close window and OpenGL context
+-------------------------------------------------------------------------------------------