Constructor
new FrameData()
constructor for the FrameData class. The data is automatically populated
on creation using timing data from the previous frame that is stored in
the Simulation.lastFrameTime and Simulation.firstFrameTime variables.
If dt is greater than 100ms (for example when switching windows context,
or by changing tabs) then dt is set to 10ms. Due to this time manipulation
the time since start is different to the sum of all dts. Time since
start is always the true difference between the start time and the
current frame time.
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