Fix race conditions in froot and Solver::timeExceeded #2587
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Static variables should have been declared thread-local, but haven't.
Fixes race conditions in froot, which could have resulted in incorrect simulation results for models with events/heavisides/piecewise, for multi-threaded simulations.
Fixes race conditions for the max-time check, which could have resulted in incorrect termination of simulations in case of multi-threaded simulations in combination with a time limit.