Fix multi_core livelocks and add livelock debugging

Cargo.toml

src/context/context.rs

src/event.rs

src/ptrace.rs

src/scheme/debug.rs

src/scheme/pipe.rs

src/scheme/sys/block.rs

src/scheme/sys/mod.rs

src/scheme/user.rs

src/sync/wait_condition.rs

src/sync/wait_map.rs

src/sync/wait_queue.rs

src/syscall/debug.rs

src/syscall/futex.rs

src/syscall/process.rs

src/syscall/time.rs