- Add `MpscQueue` for thread-safe task scheduling.
- Add `ToxRunner` to execute Tox instances in dedicated threads.
- Update `Simulation` to coordinate time steps across multiple runners using a synchronization barrier.
- Refactor `FakeMemory` and `FakeClock` to be thread-safe.
- Update `tox_network` helpers and tests to utilize the threaded runner infrastructure.
Introduces a new testing support library 'testing/support' that provides
a clean, modular, and fully deterministic environment for testing
toxcore components.
For backwards compatibility, we also `#include "tox_options.h"` in
`tox.h`, but in 0.3.0 we can break that so most toxcore client code
doesn't need the options, only the part that creates the instance.
iphydf