Added simulation files.

simulation/HotdogSimulation.py

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+from Simulation import Simulation
+class HotdogSimulation(Simulation):
+    def __init__(self) -> None:
+        self.ticks_left = 5
+
+    def start(self):
+        print(f"DEBUG: simulation started.")
+    def use(self):
+        print(f"DEBUG: someone ate the hot dog! 🌭")
+    def tick(self):
+        self.ticks_left -= 1
+        if self.ticks_left == 0:
+            print(f"DEBUG: simulation out of ticks, expiring.")
+            return False
+        return True
+    def stop(self):
+        print(f"DEBUG: simulation stopped.")
+        pass

simulation/README.md

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+This is a simple example of a pluggable object simulator.  If you run the
+SimulatorRunner file, it'll throw up a GUI file picker if a simulation class
+isn't specified on the command line.  It will then:
+
+* Run the simulation class's `start()` method,
+* Call its `tick()` method,
+* Call its `use()` method,
+* then call its `stop()` method once `tick()` returns false.

simulation/Simulation.py

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+from abc import ABC, abstractmethod
+
+class Simulation(ABC):
+    @abstractmethod
+    def start(self):
+        "Start the simulated object."
+        pass
+
+    @abstractmethod
+    def tick(self) -> bool:
+        """
+        Simulate one clock tick.
+        Returns:
+            bool: True if the simulation could advance one clock tick, or False if the object is expired.
+        """
+        pass
+
+    @abstractmethod
+    def use(self, *args, **kwargs):
+        """
+        Use the simulated object.
+        Args:
+            args (tuple): A tuple of arguments.
+            kwargs (dict): A dictionary of key-value pairs of arguments.
+        """
+        pass
+
+    @abstractmethod
+    def stop(self):
+        "Stop the simulated object."
+        pass

simulation/SimulationRunner.py

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+from importlib import import_module
+import tkinter as tk
+import os
+import sys
+from time import sleep
+from tkinter import filedialog
+from abc import ABC, abstractmethod
+
+class SimulationRunner:
+    def __init__(self, simulation) -> None:
+        self.simulation = simulation()
+        self.simulation.start()
+        while self.simulation.tick():
+            self.simulation.use()
+        self.simulation.stop()
+
+if __name__ == '__main__':
+    if len(sys.argv) == 1:
+        # Create a hidden root window
+        root = tk.Tk()
+        root.withdraw()
+
+        # Open the file chooser dialog
+        file_path = filedialog.askopenfilename()
+        print(f"Selected file: {file_path}")
+    else:
+        file_path = sys.argv[1]
+
+    # Get the python file's directory and filename
+    module_dir, module_file = os.path.split(file_path)
+    # Get the python file's name without any extension
+    module_name, _ = os.path.splitext(module_file)
+
+    # Add the module directory to sys.path so we can import it unqualified
+    sys.path.append(module_dir)
+
+    simulation = import_module(module_name)
+    # Load the simulation module's simulation class, which should be the same
+    # name as the module name.
+    simulationrunner = SimulationRunner(getattr(simulation, module_name))