Allow for running the model step wise

[BryceHaley]

Allow the model to be ran until the trap is closed and output results at that point. This will make the UI a lot easier and less buggy when users can select how many fish to harvest at low tide.

The model needs to able to start off where it left off.

This may necessitate the creation of a "model" object or simply be a series of parameters passed into functions.

[BryceHaley]

This is being worked on in the branch "issue_5". Will merge and kill that branch when completed.

[BryceHaley]

Created new functions

• plot_values() accepts an array showing the history of the trap and produces a plot
• run_trap_harvesting() takes in a model of a trap completed up to an hour where harvesting is available and a value for the selected harvest and runs until harvesting is available again

the harvesting variable was removed as a parameter for other plotting functions