Create tests for all async effects

[Pikachu920]

Tests should be created for all current + future async effects ensuring that local variables function properly before and after their execution. For example:

test "teleport local variable persistence":
  set {localTest::EffTeleport} to random uuid
  set {_local} to {localTest::EffTeleport}
  spawn a creeper
  teleport last spawned entity to spawn of (world of last spawned entity)
  assert {_local} is {localTest::EffTeleport} with "local variable does not match (%{_local}% != %{localTest::EffTeleport}%)"