Feature request: addbibresource remote support + better suffix handling

[sdrobert]

Thanks for the project! It helps out a lot when writing papers.

In biblatex, \addbibresource more powerful than its \bibliography bibtex counterpart. It allows multiple formats for bibliographies, as well as the option of remote resources. Here's a
cheat sheet.

I'd like to request support for remote repositories, as well as arbitrary suffixes. This is especially useful when combining latexer with PULL requests from better-bibtex, a pretty spiffy Zotero extension.

To aid in remote testing, please feel free to use the following

\addbibresource[location=remote]{http://www.cs.toronto.edu/~sdrobert/info/publications/robertson2019}

I've also scoured GitHub for a remote bibliography that wasn't my own, ending in the suffix .bib. Suffice to say latexer did not work when I found one.

I understand if this is too much of an ask, and thank you for reading either way.

Regards,
Sean