managed old tutorial implementation with classes.

Bugs: nothing is displayed

MshViewer/Shader/VertexTextureShader.mv2shdr

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+#version 450 core
+
+// Input vertex data, different for all executions of this shader.
+layout(location = 0) in vec3 vertexPosition_modelspace;
+layout(location = 1) in vec2 vertexUV;
+
+// Output
+out vec2 UV;
+
+// Values that stay constant for the whole mesh.
+uniform mat4 MVP;
+
+void main(){
+
+	// Output position of the vertex, in clip space : MVP * position
+	gl_Position =  MVP * vec4(vertexPosition_modelspace,1);
+
+	UV = vertexUV;
+
+}