Implement instance_destroy based on copy-on-write entity lists
#46
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Entity lists are now copy-on-write. This lets the interpreter keep iterators pointing into them while (potentially) mutating them, and preserves GML `with` semantics in the presence of such mutation. In particular, this makes `instance_create` and `instance_destroy` memory safe when called from GML, as described by #40.
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This addresses the
withproblems described in #40.