SDK/Theme Update: Add inner scrolling for really long options

We’ve added a new variable, --yxt-filter-options-options-max-height. By default this is none.

In your answers-variables.scss, specify the variable to add a maximum height. For example, if you were to add

--yxt-filter-options-options-max-height: 200px;

You’d see inner scroll added for filters that are greater than 200px.

Note: If it’s necessary for this to work on IE11, you’ll need to add it under :root in answers-variables.scss, not under .Answer in answers.scss. This has to do with how we ponyfill css vars on ie11, and we have an upcoming fix for.