* feat: decode IWI6 wavelet textures
* refactor: validate wavelet Huffman tables at compile time
* chore: small code style adjustments to IwiLoader
* chore: small code style adjustments to IwiWaveletDecoder
* fix: use shift right operator to better handle edge cases
* chore: add wavelet support for iwi8
* chore: add wavelet support for iwi13
---------
Co-authored-by: Jan Laupetin <[email protected]>
