Nightly Build - 8/23/2021

- implement dds loading for cubemap, 3d texture types
- implement project file embedding for cubemap and 3d textures
- Broad changes to texture handling. CPU-side data is kept concurrently with GPU-side data and updated along with it, allowing multi-threaded texture operations for textures. Mirroring texture data on both CPU/GPU sides allows texture access for both the CPU raytracer and GPU shaders.
- change direct lighting from world space to view space for increased precision
- add toggle for auto-conversion of textures at load time to 8-bit RGB values, which was previously the only option for loading.
- several fixes to texture tools. See README.txt for more details.