Interface Draw-styles: Basic Implementation and "Flat" Test Style
Depends on D1423
Adds basic stuff needed for draw-style option, a "Classic" style (which should look like current master) and a "Flat" style for testing (really similar to "Classic" style).
So far, differences between draw-styles are really small. Mainly some tweaks in draw-base initialization and radii. Guess we have to see how things further develop to find out if the current approach is the best one (implementation wise).