v0.4 parse Vertex Shader layout info gives code

Ok, so there's a new button at the bottom of the editor, "Parse Vertex Shader Layout", and it does just that, it parses the Vertex Shader Layout code as you have it in the shader, and outputs OpenGL Vertex Attribute function calls that are compatible with the layout in the Vertex Shader.

As usual, any and all feedback, criticism is welcome, thanks!