Make the minimalistic backlinks counter optional

Show separate counters for references, tags, and embeds by default rather than grouping them all into the same counter in editor view. Motivation: tags are already functionally used for different things: transitive tagging and adding templates. Further, any user may choose to use any linking features to serve different purposes.

In my case, tags are heavily used to manage sources, while references for connecting my notes, therefore it's quite important for me to be able to tell the different counts at a glance. (It's also bugged at the moment so you can't even scroll the preview that comes up when clicking the counter)