SimpleTurtle L-System Renderer
    by Starbeamrainbowlabs

Usage:
    ./SimpleTurtle.exe {options}

Options:
    -i  --input-file    The file that contains the input L-System parameters. Defaults to stdin.
    -o  --output-dir    The output directory in which to save the rendered / simulated L-System generations. Defaults to the name of the input file, minus the file extension - or just simply 'l-system'.
    -s  --skip-gen      The starting generation. Default: 0.
    -c  --count         The number of generations to render. Default: 5
    -d  --step-dist     The number of pixels the turtle will walk forwards at a time. Default: 25.

Input File Format:
	The first line is the seed (the starting state).
    Subsequent lines beginning with a # (hash sign) are ignored.
    Rules are declared with an equals sign - i.e. f=f-f+, or fb=fbfafcfafb.
    Lines starting with an exclamation mark specify directives that should be passed to the turtle - i.e. !angle=1.0472
    The L-System is rendered at each generation. Any character the turtle doesn't understand is ingored.

    Turtle Characters:
        f   Move forwards
        h   Also move forwards
        +   Turn clockwise
        -   Turn anti-clockwise
        [   Save position & heading to stack
        ]   Restore position & heading from stack

    Turtle Directives:
        angle    Sets the angle by which the turtle should turn. Note that this is specified in radians.

Example Input Files:

Hilbert Curve:
-----
a
a=-bf+afa+fb-
b=+af-bfb-fa+
-----

Dragon Curve:
-----
f
f=f-h
h=f+h
-----

Sierpinski Triangle
-----
f
!angle=1.0472
h=f+h+f
f=h-f-h
-----