Don't explicitly panic or block when avoidable #147
Merged
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This crate has a number of unwraps and asserts that could be avoided and result in a bit of extra, potentially unnecessary, codegen, and its use of a std RwLock/Mutex does result in unnecessary blocking.
This PR converts any explicitly done (read: non-allocator) panics into handled errors, as well as moves stealing to not block when it cannot obtain a read lock on the queues.