LT-73 Move export tool and progress dialog component to OHIFViewer

Packages/viewerbase/client/components/basic/progressDialog/progressDialog.styl

@@ -0,0 +1,18 @@
+#progressDialog
+  display: none
+  position: absolute
+  top: 0
+  bottom: 0
+  left: 0
+  right: 0
+  margin: auto
+  width: 20%
+  height: 15%
+  z-index: 100
+  border-radius: 5px
+  padding: 10px 20px 10px 20px
+  background-color: rgba(255,255,255,1)
+  outline: none
+
+  .dialogContent
+    margin-bottom: 20px