function Style(id, size, multiplier, cramped) {
    this.id = id;
    this.size = size;
    this.cramped = cramped;
    this.sizeMultiplier = multiplier;
}
The main style class. Contains a unique id for the style, a size (which is
the same for cramped and uncramped version of a style), a cramped flag, and a
size multiplier, which gives the size difference between a style and
textstyle.