Qore 1.12.4

What's Changed

• refs #4634 fixed WebSocketHandler::sendOne() by @davidnich in #4636
• refs #4637 allow information about schema changes after alignments to… by @davidnich in #4638
• refs #4639 allow for the client's time zone to be set for serializati… by @davidnich in #4641
• refs #4643 fixed handling signal args by @davidnich in #4644
• refs #4646 allow REST handlers to set custom headers in error responses by @davidnich in #4648
• refs #4656 implemented support for pre-encoded URLs in the HTTPClient… by @davidnich in #4657
• refs #4658 fixed a race condition in deadlock detection where a deadl… by @davidnich in #4659

Full Changelog: release-1.12.2...release-1.12.4