The handlers for textDocument/references, textDocument/documentSymbol,
and workspace/symbol open their results in the quickfix list by default
and are not configurable. They are also incompatible with `vim.lsp.with`
as they do not accept a configuration parameter.
Add a `config` parameter to the handler for these three messages which
allows them to be configured with `vim.lsp.with`. Additionally, add a
new configuration option 'loclist' that, when true, causes these
handlers to open their results in the location list rather than the
quickfix list.