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Merge remote-tracking branch 'origin/master'

Bumping version to 1.16.3

Fixing unused var warnings in MSVC

Fixing some bugs related to changing the default from -tex_array to -…

…individual:

- If -output_file is specified and there's more than 1 input, it errors out as this would overwrite the output file multiple times
- Tex types cubemap/3D default to tex_array mode

Update README.md

Update README.md

Merge pull request BinomialLLC#234 from omar-polo/master

fix the build on OpenBSD

Merge pull request BinomialLLC#234 from omar-polo/master

fix the build on OpenBSD