TODO.txt

bugfixes:
- look into blending with background color (screenshots did not match shown rendering -> hotfix applied in volume frag where blending is now allways done)
- fix view and projection matrix when lookat is not at the origin (put creation into update functions such that code is not copied) -> see geotherm project
    -> also affects zooming via scroolwheel
- merge changes to util::framebuffer class from inpreCICE

refactoring:
- write own shader utility class

features:
- provide documentation on loadable data sets and volume configuration files
- provide documentation on configuration options (available in gui and configuration file)