Altered ldt_annotate serializer to allow for serializing id for editing annotation + Added Markers widget that allows to make and edit 0 duration annotations.
/*
* Segments Widget
*/
.Ldt-Segments-Segment {
position: absolute; margin-left: -1px; border: 1px solid #ffffff;
}
.Ldt-Segments-Position {
background: #fc00ff;
position: absolute;
top: -1px;
left: 0;
margin-left: -1px;
width: 2px;
bottom: -1px;
z-index: 80000;
}