Make --font-file accept "-" to mean stdin, and have it work
in Windows too!

Apparently there's no equivalent to "/dev/stdout", so write using
stdio to be able to output to stdout.

Now we can use the same code to do other utils...

Where causing issues for people with MSVC.

Not used for anything right now.  Will use to get num_glyphs in the future.

Step version up to 0.5.0.

Also, fix to pass "make distcheck"

Also optimizes the common-direction script lookup.

This reverts commit c939f6aff405ca7b10b1f1538f46148bff719fcb.