reverse/restore order of verbs in path to be forward (normal)

As part of this (clean up), also removed support for serialized-paths
older than version-4, which was introduced Feb 2018.

Change-Id: I2dc74a52bb8bdd7ea0cb2d8a78b644ca783eb31f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/239102
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Mike Reed <reed@google.com>
8 files changed