title: Method replacements for material ui v4 to v5 upgrade
body: <p>I'm currently migrating from v4 to v5, but it appears <code>@material-ui/core/styles/colorManipulator</code> wasn't carried over or is accessible differently. I tried to find info about it in the docs and migration guide but didn't see anything. Is there an alternative that should be usied to access methods such as <code>darken()</code>? also i'm looking for the alternative to getting styles from things i.e. <code>import { styles as FabStyles } from &quot;@material-ui/core/Fab/Fab&quot;;</code> in v5. I don't see away to access the individual styles now.</p>