If equirectangular input, should inject spherical data

[himynamesdave]

All .360 videos are converted into equirectangular projection type.

Any .mp4 should be checked to see if it is equirectangular projection type (some are flat)

Therefore, spherical metadata should be written into images when equirectangular projection type is present

https://github.com/trek-view/gopro-frame-maker/blob/dev/docs/LOGIC.md#spherical-metadata-360-input-and-equirectangular-videos-only

[karamvirup]

XMP metadata working now

[himynamesdave]

@karamvirup this does not work with equirectangular mp4's