If the user declines a fix, it will stop fixing the file it's looking
at and go on to the next one.
If they accept the fix, we have to re-run diagnostics, because fixes
can change offsets and line numbers.
Add tests that invoke the `fennel-ls` executable as a subprocess.
I received feedback that the info on setting up libraries is a little
buried in all the other details.
Pulling it up, it's likely going to be the first and most frequent
configuration people will want to change.
The first thing to change is to load the love2d docset inside a pcall,
because it's not included in the standard `make` build, so we need to
not crash if it's not present. Note that we are storing these under
libraries.love2d rather than libraries.love-2d, because even tho it's
inconsistent with tic-80; I've never seen them use the hyphenated
version, and now the name matches the module name.
Secondly, we extend the get-global function to work with anything in
the server.configuration.libraries table, not just hard-coded to
tic-80.
Finally, update the manual to reflect the removal of the love2d hypen.
