KTX texture storage format parsing.
Parses byte data according to https://www.khronos.org/opengles/sdk/tools/KTX/fileformatspec.
```rust use ktx::{include_ktx, Ktx};
let image: Ktx<'static> = includektx!("../tests/babg-bc3.ktx"); asserteq!(image.pixel_width, 260); ```
This crate is maintained with latest stable rust.