First implementations of push, pop, shift and unshift for VMArray.
First implementations of push, pop, shift and unshift for VMArray.

Most of the groundwork is in place now. Next: Fixing the bugs.

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp