Move the "turtle" a distance leaving a line showing its path.
Create a "turtle" with a place to draw. This appear on the first turtle command.
As a proof of concept FORWARD moves only an integer number of pixels where the motion appears instantaneous.
TICK 5 FORWARD 20
A "turtle" is an instance of class Turtle saved in state.turtle. The constructor creates an SVG element and adds a dot that is moved as FORWARD add an additional SVG line. Similar to TURN.