Radio Checkbox Groups allow you to have checkboxes which behave like radio buttons when Option-clicked or long-pressed. This is not a standalone script; if you include it you must first include longpress.js.
To use it, add class="radio-checkbox-group" to a container. Now any checkboxes
within the container will behave normally when toggled, unless the Option key (on
a Mac) or Alt key (on Windows) is held, or if the checkbox is long-pressed on a
phone or tablet or long-clicked on computer. Any of these gestures will trigger the
radio-checkbox-group behavior.
The radio-checkbox-group behavior is very straightforward. If any checkbox other than the target is checked then the target will be "soloed", which is to say that it will be checked and all of the others will be unchecked. If all checkboxes other than the target are unchecked then the soloing will be cancelled and all checkboxes will be checked.
Note that soloing and de-soloing will trigger change events for many of the
checkboxes in the group. If your change-handling code needs to know which checkbox
was actually clicked, you can check event.target.isSoloTarget; this will be true
for the checkbox the user clicked on and undefined for all the rest.
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