further pruning of legacy render code, now runs on opengl 3.3 core

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shaders/vbocolor.vert

@@ -1,7 +1,7 @@
 #version 330
 
-layout (location = 0) in vec3 v_vert;
-layout (location = 1) in vec3 v_color;
+in vec3 v_vert;
+in vec3 v_color;
 
 out vec3 f_color;
 
@@ -12,4 +12,4 @@ void main()
 {
 	gl_Position = projection * modelview * vec4(v_vert, 1.0f);
 	f_color = v_color;
-}
+}