Treewide(ish): remove long-time broken pkgs

[Mindavi]

Description of changes

Remove packages that have been broken for a while.
I didn't add aliases since most of them have been broken for so long that either nobody is using them or those people never update their systems 😆.

Note that this is not everything I found, I just cherry-picked a chunk and worked on that.

[SuperSandro2000]

Not sure about not adding aliases but removing them in general is fine for me.

[Artturin]

We should codify "packages that have been broken for longer than 2 releases can be removed without adding aliases"

[Mindavi]

I think it's fine for packages that have been broken for so long. Nobody cared about them enough to get them fixed, so I don't think they're gonna care if they're dropped.

I just pinged the people working on ue4 though, apparently they've been looking at this on and off since 2016, but so far there's no fix. So I still propose to drop it and let them submit a new version if they ever get around to it.

Looked through the issues and didn't find anything else about these packages.

[Mindavi]

Dropped the ue4 removal and linked to the issue in nixpkgs. Not certain if we really want to keep it though. I'd vote for removing it still, if there's no new activity on the derivation.

[Mindavi]

nixpkgs-review says:

10 packages removed:
libdap (†3.20.6) multibootusb (†9.2.0) neopg (†0.0.6) openbr (†0.5) openbr (†0.5) openbr (†0.5) pdftk (†2.02) rapcad (†0.9.8) samsung-UnifiedLinuxDriver (†4.00.39) vogl (†2016-05-13)