Add citation and bibliographic entry IDs and the ability to link to bibliographic entries

[arothuis]

This PR introduces the following breaking changes:

• adding <span> wrappers with an id to citations will become default behavior
• adding bib-ids based on the position in the .bib-file will become default behavior

This is, in general, a useful addition as it leads to more customizability (i.e. via CSS or JS).

Using these ids we can link citation to bibliographic entries.
For this, the linkToBibliography configuration option has been added.

In addition, the following changes are introduced:

• updated outdated dependencies
• incremented version number

This resolves #3

[arothuis]

Considering the size of this PR, I will do some manual testing before merging.