OHIF-184: Add menu tool option to download viewport as PNG or JPEG (#130)

* OHIF-184: added download icon to the OHIF's tool bar

* OHIF-184: refactor dialog toggle method to support cine dialog and download dialog

* OHIF-184: Added hotKey support for downloadDialog.

* OHIF-184: added disabled verify function

* OHIF-184: Finished form structure. Created preview canvas. Added width and height config of the preview. Added the download feature. Added Cancel button.

* OHIF-184: setting default extension as png

* OHIF-184: moved download icon to more in toolbar

* OHIF-184: enabling/disabling tools when toggling show annotations checkbox

* OHIF-184: using a dynamic canvas to create the download content

* OHIF-184: Download with configurable width and height. download distorced

* OHIF-184: using dynamic elemento to manage download image instead of using the preview element

* OHIF-184: make dialog dragable through preview

* OHIF-184: removing useless line

* OHIF-184: adding download icon to leasion tracker

* OHIF-184: adding download dialog template to lesion tracker viewer

OHIFViewer/client/components/viewer/viewer.html

@@ -2,6 +2,7 @@
     {{#if and Template.subscriptionsReady}}
         <div class="viewerDialogs">
             {{>cineDialog}}
+            {{>downloadDialog}}
             {{>layoutChooser}}
             {{>annotationDialogs}}