Varied Scenes

More varied scenes:
Mountains
Fields
Desert
Added structure generation:
Cactus
Oak Tree
Added reflections
Added GUI and basic graphical options

0.0.1-2

Fixed the crash causing a memory out of bounds access

0.0.1

This is the first "stable pre-release" it currently supports:
Basic reprojection
A low level ray pass for speeding up full resolution traversal
Checkerboard rendering
Basic terrain generation with caves and trees
Shadows and probes
Light absorption
Material definition
Using AVX2 for speeding up directions
The traversal uses raymarching but falls back on multi level dda if step size is too small
Calculating distance fields somewhat fast
LoDs
Branchless dda
Allows to render at a lower internal resolution to stretch the final image however no advanced upscaling is done