Fully OpenGL accelerated version incoming!

After forgetting to publish the release notes for 0.11.0, 0.12.0-beta is in the works, and is nearing completition, which means rendering is now fully OpenGL accelerated. This means massive speed improvements and reworked memory management and other achitectural changes. Also more and more of the engine is being moved away from the tracing garbage collector of DRuntime to refcounting, starting with the new rendering pipeline, while trying to keep the DRuntime as an option for at least some platforms.

Currently I'm in the process of hunting down bugs that were introduced by the changes, some of which seem to be related to potential memory leakage. Most testcases now compile and run for the most part.