Fix rerender caused by style override

[fzaninotto]

Problem

1. Many components allow style override by way of a custom classes prop (as accepted by useStyles), but implement it a way that causes unwanted re-renders (useStyles({ classes: classesOverride }), which defeats React.memo because the parameter is always a new object) and harm performance
2. Some components allow style override by will pass the classes prop down to their children

Solution

This PR makes all components work the same way:

• either they allow style override by classes, in which case it's performant and dosn't leak, or
• they don't allow style override.

This change is backwards compatible.