Options can now be selected at
command line without requiring
separate builds of the code

Fixed bug in testbed code

Adjust python api to output slices from
an image so that this can be done from
the command line

Plus additional goodies, such as
- equirectangular camera support
- OpenGL 3.1 support
- more accurate voxel pruning for training
- cleaner GUI

When building with MSVC, generator expressions are required to utilize the correct DLSS library files -- else the build fails

- SIMPLE_RADIAL_FISHEYE
- RADIAL_FISHEYE
- OPENCV_FISHEYE

Can also pass datasets, network configs, or snapshots as positional arguments now.

Makes f-theta and latlong modes more meaningful and paves the way for a future Orthographic mode

Courtesy of Eric Haines