Support ktx2 compressed textures #1260
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Reintroduced the changes done in #1254 using a clean fork since history was messy.
Support for parsing Ktx2 files with ETC or UASTC encoded textures, transcoding to BPTC, DXT, ETC2 or ASTC.
WIP since we are currently not using the res system and doing our own loading, so is not integrated with res system and only supports js target.
However we are working on a new framework where we would like to make use of res system and pak loading. I tried to implement async loading for compressed textures using the AsyncLoading flag, but could not make it work.
Will revisit this soon and try to solve the res integration, but leaving this up here for now if anyone has ideas or is interested in getting this working for native.