One less argument to type in typical testing workflow!

Most common usecase of hb-view is to test rendering of short words for
testing / inspection.  Not having to type "--font-size 150" each time
isn't such a bad idea...

Also fix cairo cluster generation.

For some reason it doesn't quite work with IranianNastaliq, but
that looks like a font issue.

Also remove shaper_options argument to hb_shape_full().  That was
unused and for "future".  Let it go.

More shaper API coming in preparation for plan/planned API.

This means the --features indices also refer to char position
instead of byte position now.  Same for cluster values reported
by hb-shape.

Will add an option for byte indices later.

Ok, much more useful as a test suite driver now.

Wow, who knew bool is one byte and I was using it as a 4byte int?!

C++ auto casts fails you in mysterious ways...

Like hb-view, but prints out buffer contents.

The output format is kinda cryptic.  Suggestions welcome.

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.