Case Sensitive Badges

[brheinfelder]

First of all, great plugin! I find it limiting though that badge identifiers get converted to all lowercase when created as html data attributes. It's nice that you provide syntax for creating custom badges, but I want to be able to reuse custom badges throughout my vault without typing the whole line out every time. To this end, using css snippets is much simpler. I use shorthand for my identifiers, so having access to lowercase and uppercase for those identifiers is important to me. Happy to submit a PR if necessary, but wanted to suggest it here first.