Fix ROI UAF cluster and bump Emscripten INITIAL_MEMORY to 128 MB

[foxtacles]

Collection of fixes based on crash reports collected from isle.pizza - these aren't easily reproducible as they require a lot of of specific game state to build up first.

Fixes a long-running use-after-free cluster in LegoAnimActorStruct::m_roiMap / LegoROI per-element references, plus adds
-sINITIAL_MEMORY=128mb to the Emscripten link options.

1. m_roiMap array ownership. LegoAnimActorStruct now deep-copies the ROI map array and deletes copy-assignment, so LegoExtraActor's implicit copy-construction (legoextraactor.cpp:173,185) no longer shares ownership with the source presenter and double-frees at destruction.
2. Per-element slot back-references. LegoROI tracks every LegoROI** slot that points at it; its destructor nulls each registered slot. LegoAnimActorStruct, LegoAnimPresenter, and LegoLocomotionAnimPresenter::CreateROIAndBuildMap register/unregister around their array lifetimes, so a freed ROI cannot leave a dangling pointer in an outliving array.
3. Dormant-actor sweep on Suspend. LegoAnimationManager::Suspend now invokes ClearMaps() on every persistent LegoExtraActor, not just those in m_extras. Despawn paths (~line 1543, ~1910) previously null m_extras[i].m_roi without ClearMaps, so dormant actors could retain stale m_AnimTreePtr values into presenters whose LegoAnim* got freed at world teardown. New ClearMaps overrides land on Act2Actor, Act3Cop, Act3Brickster, Act3Shark, LegoRaceCar, and LegoExtraActor to null their cached anim pointers.