Fixed problem with wrong OGL context version in shared widgets.
Renaming stuff in GUI/TF
Reimplementing renderers to GLSL.
Slice rendering in GLSL.
Volume rendering improvement.
Shading in volume renderer.
Framebuffer method renaming.
Updates for changes in soglu and vorgl.
Update soglu reference.
Switching to OGL core profile.
Reenabling density rendering mode, bug in TF rendering occured.
Adding general viewer slot for reloading renderers shaders.
Adding raycasting test shader.
Continuing in raycaster implementation.
Refactoring for ray casting volume rendering.
Different shader loading
Fixing shader compilation.
Using new shader configuration format.
TF and density raycasting shaders.
Reorganization of volume rendering, interface updates, viewer options widget.