This uses the PHP releases API. Limitations:
1. New Major versions will needed to be added manually
The src for the API is at https://github.com/php/web-php/blob/master/releases/index.php
The data comes from https://github.com/php/web-php/blob/master/include/releases.inc
This commit keeps the old sort method for a cleaner diff. Next commits
in this PR will fix the sorting to be standardized.
The difference from using tags is:
1. One additional version shows up (4.0.4) which we'd missed previously
due to being tagged as php-4.0.4REL.
2. Slightly more accurate dates.