Addition changes to enable Verify.Cli app

[flcdrg]

• Add simple constructor to InnerVerifier for just comparing files
• Ensure replacements field is valid even if we haven't called UseAssembly

Assists with #716

[flcdrg]

Coming back to this, as https://github.com/flcdrg/Verify.Cli/ is just wanting to compare a file, it doesn't have the extra type stuff that the existing constructor requires (and trying to fake it gets messy).

This change, or something like it should enable file verification by being able to reference to the Verify nupkg

[flcdrg]

Hmm.. that change to ApplyScrubbers is breaking tests. I've got something wrong there.

[flcdrg]

I think this is ready to review. Mac build had some kind of hiccup and needs to be re-queued.

[flcdrg]

Test is failing.. trying to figure out why. I can't help but notice that there's two dots in the deleted output - that seems suspicious.

VerifyException: Directory: C:\dev\git\Verify\src\Verify.Tests

VerifyException
Directory: C:\dev\git\Verify\src\Verify.Tests
Delete:
  - sample.verified..txt
Equal:
  - Received: sample.txt
    Verified: sample.verified.txt

[SimonCropp]

https://github.com/VerifyTests/Verify/pull/888/files#r1205478076