★Garbage Collection★

[qpfiffer]

• Create simple userland allocator that everything goes through to track objects
• Create vector_remove function.
• Create GC graph node struct with:
  • Pointer to the lair value
  • Generation enum
  • Vector of parent pointers to other graph nodes (things that own this node). Once you run out of parent pointers, delete yourself.
  • Vector of child pointers as well
  • All deletions should cascade. cc @lykkin