Consider - Weak SyncManager references to aid in deadlock detection

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When implementing deadlock detection, consider tracking weak references in a static list to aid in detection across SyncManager instances.

Whether or not this gets implemented depends on impact to performance, which depends how it'll be used, synchronized (must be thread safe), and structured (must have minimal impact to both speed and memory usage).

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This is separate from deadlock detection in that it can (and would almost have to) come later.
I'm also not entirely sure this is something desired (or why have multiple sync managers). It may also be impractical to implement this. All TBD and separate from detecting (within one SyncManager) a deadlock.