Add HashLink (a Haxe bytecode VM)

[Asilo]

HashLink (available on Github) is a virtual machine for Haxe.
RST game Northgard use it.

Project name/link	Implementation language	GC	License	Notes
HashLink	C	Tracing (Lazy sweep)	MIT	A bytecode interpreter and baseline JIT-compiler (x86/x86-64 only) for Haxe.

[D. Bohdan]

Added in 28de736. Thanks!