* fileserver: Fix try_files for directories, windows fix
* fileserver: Add new file type placeholder, refactoring, tests
* fileserver: Review cleanup
* fileserver: Flip the return args order
* fileserver: First attempt to fix failing test on Linux
I think I updated the wrong test case before
* Make new test function
I guess what we really are trying to test is the case insensitivity of
firstSplit. So a new test function is better for that.
We can't use a positional index on an original string that we got from
its lower-cased equivalent. Implement our own IndexFold() function b/c
the std lib does not have one.
* matcher: Add `split_path` option to file matcher; used in php_fastcgi
* matcher: Skip try_files split if not the final part of the filename
* matcher: Add MatchFile tests
* matcher: Clarify SplitPath godoc
