* Started reworking the scene rendering to sample
Use glTF instead of ASSIMP, per-material pipelines, material loading, etc.
* Visibility toggle for scene nodes
* Fixed lighting, updated GLSL and HLSL shaders
* Renamed sample
* Code-Cleanup, comments, validation fixes
* Android build
* Started on tutorial for glTF scene rendering sample
* Minor code cleanup
* Adding new chapters to the tutorial for glTF scene rendering sample
* Added info on normal map shader bindings, spelling
* Added drawing chapter
* Getter for texture descriptors
Makes code a easier to read
* Renamed glTF scene sample
* Add markdown files to projects
* Updated readme, separate chapter for glTF samples
* Comments
* Removed unused screenshot
Move `data/shaders` to `data/shaders/glsl`
Move `data/hlsl` to `data/shaders/hlsl`
Fix up shader paths in the cpp files to point to the new glsl location.
`data/shaders/hlsl/compile.py` still overwrites the glsl .spv files (for
now).
Issue: #723
