pre-0.18.0 - Projection adjustments

Testing build for a new projection adjustment feature

• Allows for pitch, yaw and roll adjustments with real-time preview
• See https://discuss.pixls.us/t/feature-preview-for-xpano/41274 for a demo

Todos:

• compatibility with vertical panoramas
• compatibility with crop mode (cropping after rotate works, not the other way around)
• computing center of rotation for more user friendly roll adjustments

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The included files are packaged by xpano-release-builder, in the build logs you can verify:

• The commit hash that was used for the build (in the "Checkout target repo" step)
• The sha256 checksum value (in the "Compute checksum" step)