changed tool name to System Simulator
major refactor in progress: major change to package structure
major refactor in progress: updated system_simulator import statements, now able to run system simulator :)
major refactor in progress: moved some utility methods to core and restructured import statements in system_simulator/main
major refactor in progress: moved some utily methods to core
major refactor in progress: update import statements in tests and make sure tests pass
major refactor complete: updated __init__ file docstrings