No support for deprecated functions

[bartbes]

The filter now hides functions/overloads based on added and removed, but ignores deprecation notices. I've added detection for these cases, and they should be marked with data-love-version-deprecated, but I have yet to decide how to display these.

There is definitely an argument to be made for hiding deprecated functions, but at the same time, they still exist. Maybe it needs to be a separate option? Maybe you want strike-through text instead. Maybe you want to grey the options out. Either way, this strays too far into design for me to be of any use.