Allow saving time index to the base source for all simulation objects,
as well as support to visualize simulations in time in the viewer.

If user pushes the play button while the simulation is playing it will
pause the simulation at the current time index. Pushing play again
causes the simulation to restart from paused position. Also, simulations
will now play from current time index instead of defaulting to starting
at zero. If the current time index is the last one it will set time to
zero and start from the beginning.

Run astyle (3.4.11) on all files modified .cpp and .h files in this
dynamic geometry addition.

Add a shape that handles dynamic motion, synchronized with the motion
of geometries and sources.

Fix flickering that occurred when dragging the time slider with the
mouse. Particle tracks would flash on the screen from a longer time
range than the selected window.

Change the time window default to 1% of the simulation duration for
tracks visualization. Also add a new input in egs_view for the number of
time steps to take in the animation. This allows for better control of
the visual speed of the motion.