An icon may either be
a string-tag that references an entry in the iconMap (e.g. "folderOpen")),
an HTML string that contains a < and is used as-is,
an image URL string that contains a . or / and is rendered as <img src='...'>,
a class string such as "bi bi-folder",
or a boolean value that indicates if the default icon should be used or hidden.
An icon may either be a string-tag that references an entry in the
iconMap(e.g."folderOpen")), an HTML string that contains a<and is used as-is, an image URL string that contains a.or/and is rendered as<img src='...'>, a class string such as"bi bi-folder", or a boolean value that indicates if the default icon should be used or hidden.