Iterates over multiple input images

[boretom]

What kind of change does this PR introduce? (check at least one)

• [ ] Bugfix
• [x] Feature
• [ ] Code style update
• [ ] Refactor
• [ ] Build-related changes
• [ ] Other, please describe:

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [x] No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• [ ] All tests are passing
• [ ] New/updated tests are included

If adding a new feature, the PR's description includes:

• [x] Allows to pass multiple images and they are - surprise - printed in the given order, one after the other.

I have no idea if that is something you're interested in :) ... if yes, here's the PR.

Can't be merged with the "Feature: option to fit vertically instead of horizontally" without conflict. I will have to resolve that if you decide that you like this PR :)

[posva]

This is really cool but let's give it a bit more time

[boretom]

no worries, let it fermenting a bit :)

[boretom]

Let's close it since there's not much happening with this PR.