feat(runtime): support slhx drag drops

req: htmx_equivalents/002

req: dx/008

req: list/003

req: examples/001

examples/techdemo/templates/partials/issue_card.heml

@@ -1,4 +1,4 @@
-<article +class="self.class" +data-key="self.id" draggable="true" ondragstart="slhxTechdemoDrag(event)">
+<article +class="self.class" +data-key="self.id" draggable="true">
   <header><strong>{+ self.title +}</strong><span class="pill">{+ self.stage +}</span></header>
   <div class="impact"><i +style="self.impact_style"></i></div>
   <div class="card-actions">

examples/techdemo/templates/partials/issue_lane.heml

@@ -1,4 +1,4 @@
-<section +class="self.class" +data-lane="self.lane_id" +data-move-hid="self.move_handle" ondragover="slhxTechdemoDragOver(event)" ondragleave="slhxTechdemoDragLeave(event)" ondrop="slhxTechdemoDrop(event)">
+<section +class="self.class" +data-lane="self.lane_id" +data-hid="self.move_handle" data-slhx-on="drop">
   <h3>{+ self.title +}</h3>
   <p>{+ self.description +}</p>
   <template h-for="card in &self.cards">