HHVM 3.24.1, 3.21.6, and 3.18.8

These releases contains several bugfixes:

• Re-sync parse_url() with upstream (PHP7), fixing support for URLs containing usernames and passwords that contain unusual characters (3.24.1, 3.21.6, 3.18.8).
• Support the JSON_FB_HACK_ARRAYS flag for json_decode() when HHVM is built against the json-c library (3.24.1, 3.21.6).
• Fix an ordering issue that indirectly led to incorrect or incomplete IDE autocompletion results in some situations (3.24.1, 3.21.6)

HHVM 3.18 is unsupported, and we recommend migrating to 3.21 or 3.24 as soon as possible. We are making an exception by releasing 3.18.8 as it fixes a regression we recently introduced in 3.18.7 - we are not expecting to release any further 3.18 updates.