Support multi-band "from" images in map2cam

[rvwagner]

Description
When using map2cam, currently if you specify a multiband image as the "from" image, only band 1 gets reprojected to match the "match" image. I have a couple of projects where it would be useful if all of the "from" image bands were reprojected, creating a multi-band output image (currently I'm looping over all bands of the "from" image, running map2cam for each, and then cubeiting them together again, but making sure I keep the band ordering the same is a hassle). I have the same need to get proper areal statistics in camera space as in #3856.

A potential complication I could see is that if the from and match images both have the same >1 number of bands, the user expectation might be that map2cam would pair them up, projecting from+1 to match+1, from+2 to match+2, etc. Currently, it appears that if you provide two multi-band images, map2cam only projects from.cub+1 to match match.cub+1, and all other bands in both files are ignored, so any multiband support would be brand new behavior with no existing usage to support.

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[Kelvinrr]

Gonna bump this, I think in the past it hasn't been worked on because it has a workaround but seems like a good feature to have.