chart2.opengl to vcl.opengl

Change-Id: Idd3b6ddec5ba2fbc56b7b9eb45ff379425104527
move the renderToFile function to the helper to avoid the context

Change-Id: I5493126047179d67b2f2ed0d3d5d936ebbaf4810
Die, die, die BMP code

This is at least the forth time that I kill this code!

Change-Id: I038a03a8beed6f743ce6ad17a6a6b71085f43890