Rename variables

[eksperimental]

This is part of #1009, but split in a separate commit to ease the reviewing process
It renames variables since it was a bit of a mess and confusing to work with.

[josevalim]

So the reason why it is called autolink is because it is about autolink information. It makes sense to call it compiled in the Autolink module, but calling it compiled in that module misses important information once I pass it around, because it removes all context on what compiled is about. A better name would be compiled_autolink but that would take too long. So can we please keep the variable name as is? Thank you.