refactor: Always fail hard on allocation failure in tox_events. #2264
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Partial success is not much more helpful, because at the point of
allocation failure, the client will probably need to shut down or drop
caches to free memory and request re-sends from friends. Those requests
don't exist in current Tox messages, but future history-sync based
messaging would be able to handle temporary allocation failures.
Also in the future, a single iteration will have a limited number of
events it can process at a time, configurable through Tox_Options. This
way there is an upper limit on how much memory an events iteration can
allocate. This will be necessary for security (avoiding Resource
Exhaustion Attacks, which the current events system is somewhat
vulnerable to).
This change is