Added hotkey support to viewerbase

Packages/viewerbase/client/components/viewer/playClipButton/playClipButton.html

@@ -0,0 +1,9 @@
+<template name="playClipButton">
+    <button id="playClip" type="button" class="imageViewerCommand btn btn-sm btn-default" data-container="body" data-toggle="tooltip" data-placement="bottom" title="Play/Stop Clip">
+        {{ #if isPlaying }}
+            <span class="fa fa-stop"></span>
+        {{ else }}
+            <span class="fa fa-play"></span>
+        {{ /if }}
+    </button>
+</template>