Fix physics being run with zero delta time#622
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Objective
Fixes #619.
When pausing physics, the
PhysicsSchedulecan still run even though the delta time is zero. This can cause simulation problems and sometimes even results in values becoming NaN or infinite due to division by zero.This is a regression from 0.1, which handled scheduling differently and did not run physics with a delta time of zero.
Solution
Don't run the
PhysicsScheduleif the delta time is zero.