Parameterize `plt.show()` in evaluation-related scripts

[rayvburn]

Set the parameter via YAML or CLI (preferred).

Occurrences:

• srpb/srpb_evaluation/scripts/create_bar_plot_from_results.py

  Lines 250 to 251 in 55861ae

  	# blocking call until window with the plot is closed
  	plt.show()

• srpb/srpb_evaluation/scripts/create_box_plot_from_results.py

  Line 148 in 55861ae

  plt.show()

• srpb/srpb_evaluation/scripts/rewind_experiment.py

  Line 143 in 55861ae

  plt.show()