build_url() escaped %, # and ? one by one, so a file name carrying any
other character that a URL path cannot hold - a space, a quote, an angle
bracket, a control character - was emitted raw and only resolved if the
host happened to serve the same byte sequence the index was built from.
Encode the URL that build_url derives from the file path with the URL
spec's path percent-encode set, leaving / alone so the separators between
path segments survive. % stays in the set, so a file literally named in
encoded form keeps pointing at the file that is on disk.
URLs supplied by the caller (data-pagefind-meta="url:...", addCustomRecord)
do not go through build_url and are untouched.
Fixes#619
Every --exclude-selectors value was joined into a single selector string
handed to lol_html, so one selector the parser does not support took the
whole run down with an unwrap panic. Selectors are now validated one by
one and unsupported ones are reported through the logger and dropped.
Fixes#931
dualfroz