ode_event_handler.m: Fix mishandling of event edge types and multiple events (bug #59709). * ode_event_handler.m: Correctly find events where either the direction does not matter (dir == 0) or where the edge type matches that specified in direction (dir == sign (evt)). When multiple events occur, just choose the first valid one and return the index and time of the event based on that. This simplifies the calculation of tnew and is Matlab-compatible.

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