Tidy up SonicAnnotatorArguments class

Remove unneeded (commented out) code.

Fix accesibility on _baseArguments field (protected -> private).
Improve random colours.

Now uses HSL system to choose low saturated, low lightness colours for background.

Center polygon and incoming polygons are set to opposite hue of background.

Looks pretty trippy, will probably need to be modified though.
Outline Polar Polygons

Polar Polygons are outlined with the same colour, however a bit lighter.
comment out unneeded variable