DDSLoader: Add 24bit uncompressed RGB support.

[sam6321]

Description

Adds support for 24bit uncompressed RGB textures to DDSLoader. The texture data is read from the file in RGB, and returned in RGBA format with a=1.

I came across a bumpmap texture that was using this format that could not be parsed by DDSLoader. I've attached the texture for reference.

wave_normals.zip

[Mugen87]

Interesting. Do you mind updating the webgl_loader_texture_dds and use such a 24 bit texture so we have a test case for validation?

[Mugen87]

To make the CI work, you have to regenerate the examples E2E screenshot via:

npm run make-screenshot webgl_loader_texture_dds

Besides, please revert the changes to package-lock.json (if the revert troubles you, copy the contents from dev into your branch).

[sam6321]

I don't understand why those changes are there, I've checked out that file multiple times from dev and it's still showing changes.
Should be fixed now.

I'll re-generate the examples