Clips use DICOM frameTime by default (LT-210). Added floating clip control dialog (LT-209)

Packages/viewerbase/lib/toggleDialog.js

@@ -0,0 +1,8 @@
+toggleDialog = function(element) {
+    var elem = $(element);
+    if (elem.css('display') === 'none') {
+        elem.css('display', 'block');
+    } else {
+        elem.css('display', 'none');
+    }
+};