ScrapeHeaders: Trim filenames when splitting for ;

[MarijnS95]

Fixes #1838

[MarijnS95]

TODO: Need to check how many more things need this.

[mikebattista]

TODO: Need to check how many more things need this.

Is this PR complete? Have you validated your original test case against your changes?

[MarijnS95]

@mikebattista no, unfortunately I have not set up the repro case yet nor validated all the other .Split() calls that seem like they could benefit from the same change but am not sure about. Not to speak of the many remaining untouched .Split() calls. Guess I'm in a bit over my head.

[MarijnS95]

In addition, I don't actually remember (if I ever did this at all) how to turn <Project Sdk="Microsoft.Windows.WinmdGenerator/0.59.13-preview"> into something that imports or replaces the "Sdk" with my own (local checkout of this) PR?

[riverar]

I just hit this again in another project, very annoying. Let's get this merged in and we can address any issues if they come up.