Fix Breadcrumbs not detecting frontmatter tags for Tag Notes Explicit Edge Builder

[Corbanator]

Fixes issue where Breadcrumbs could not detect tags in the frontmatter when building edges from tag notes. Fixes the issue I was having that I mentioned in #568, although I'm unsure if it fixes the problem the original issue creator was having.

Basically, it seems Obsidian may have updated their API, and frontmatter and body notes now appear in different formats and in different portions of the data, so it is necessary to check both. This also requires standardizing the formatting (whether to include the # in the string), since in frontmatter, Obsidian accepts either and displays them identically, but does not pass them to plugins identically.

I also added proper returning of errors in a couple of spots, since otherwise those return statements will just return undefined.

[jacobmichels]

I forked, created a release, and tested these changes for myself with BRAT and can confirm that that they seem to work. My tag notes work now 🚀

[Corbanator]

I almost forgot, I have a couple of small changes to make before this gets merged that I haven't had a chance to apply properly. I should have them applied tonight. It's just using a preexisting function in the project rather than hand-coding it in a few places.

[Corbanator]

Done, that was quicker than expected, I thought it had been a few lines, but it was only one.

[SkepticMystic]

Thanks for your PR! It looks good, happy to merge once I've got time and the current PR is live