Ability to set different scrollable elements

[Alex61NN5]

Ability to be able to set different scrollable elements

For example:

<!-- These Items will scroll together -->
<div data-scrollsync data-scrollsync-group="1"></div>
<div data-scrollsync data-scrollsync-group="1"></div>

<!-- These items will scroll together -->
<div data-scrollsync data-scrollsync-group="2"></div>
<div data-scrollsync data-scrollsync-group="2"></div>