Implemented state transition logging

v0.3.0

Contains ALICA v0.2.1

Added

• StateLogger object for recording each fluorophore state transition
  and the time at which it occurs.
• Example script example_run_generator_logging.bsh which
  demonstrates how to log the groundtruth output from a simulation and
  save the results to a .csv file.

Fixed

• Fixed a bug preventing the opening of a background file on Linux/Mac
  OS that was caused by a hard-coded backslash file separator
  character.

Removed

• Removed the script example_run_generator_moving_from_csv.bsh and
  made a comment about how to implement trajectory loading from an
  external file in example_run_generator_moving.bsh.