* Add `timedWait` to `std.Thread.Semaphore`

Add example to documentation of `std.Thread.Semaphore`

* Add unit test for thread semaphore timed wait

Fix missing try

* Change unit test to be simpler

* Change `timedWait()` to keep a deadline

* Change `timedWait()` to return earlier in some scenarios

* Change `timedWait()` to keep a deadline (based on std.Timer)

(similar to std.Thread.Futex)

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Co-authored-by: protty <45520026+kprotty@users.noreply.github.com>