Version 1.57.1
- Closed bugs and merge requests:
* Various maintenance [!279, Philip Chimento]
* mainloop: Assign null to property instead of deleting [!280, Jason Hicks]
* Added -d version note README.md [!282, Nauman Umer]
* Extra help for debugger commands [#236, !283, Nauman Umer]
* Crash in BoxedInstance when struct could not be allocated directly [#240,
!285, Philip Chimento]
* Cairo conversion bugs [!286, Philip Chimento]