Eliminate powershell profile and execution policy related errors

Of course you can ask! The past couple days I’ve been fighting CI, trying to get my m1 Mac and new docker builds to pass. I also need to finish adding support for hide and delete: most of the backend is done for that already.

I unfortunately tend to be ridiculously optimistic with ETAs, but I really want to have v1.0 out by end of January. The actual release will be preceded by at least a week or two of alpha and beta pre-releases, so if you’re willing to try those, you’ll get HEIF support a bit sooner.