Added a skybox. Small changes to the entity and subsequent classes.

Author: xDUDSSx

data/models/test.mtl

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+# Blender MTL File: 'test.blend'
+# Material Count: 1
+
+newmtl None
+Ns 500
+Ka 0.8 0.8 0.8
+Kd 0.8 0.8 0.8
+Ks 0.8 0.8 0.8
+d 1
+illum 2

data/shaders/skyboxFrag.glsl

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+#version 330 core
+
+out vec4 FragColor;
+  
+in vec3 TexCoords;
+
+uniform samplerCube cubemap;
+
+void main()
+{
+    FragColor = texture(cubemap, TexCoords);
+}

data/shaders/skyboxVert.glsl

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+#version 330 core
+
+layout (location = 0) in vec3 aPos;
+  
+out vec3 TexCoords;
+
+uniform mat4 pvMatrix;
+
+void main()
+{
+	gl_Position = pvMatrix * vec4(aPos, 1.0);
+	TexCoords = aPos;
+}