v0.5 Popup Copy Paste-able Built-In Variable List

I included a popup textbox (copy paste-able) to show all those pesky built-in variables, their data types, etc.  for each stage of the shader pipeline... glitches in the OpenGL Graphics Driver not excepting......!

Also, added checkboxes for rendering Triangle (3 vertices) or Quad (6 vertices, with quad over the entire screen).

I will put more control of the incoming data in future versions.