Font Family

Utilities for controlling the font family of an element.

Class	CSS Output
`font-weight-black`	`font-family: var(--font-weight-black);`
`font-weight-semibold`	`font-family: var(--font-weight-semibold);`
`font-serif`	`font-family: var(--font-serif);`
`font-[value]`	`font-family: value;`