LT-115: Add CR-Target, UN-Target and EX-Target tools (WIP)

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

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+<template name="toolbarGroupButton">
+    <div id="toolbarGroupButton" class="btn-group">
+        <button class="btn btn-secondary btn-sm dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" id="{{id}}" title="{{title}}">
+            <i class="{{groupIcon}}"></i>
+        </button>
+        <div class="dropdown-menu">
+            {{#each tools}}
+                <div><a class="dropdown-item" href="#">{{> simpleToolbarButton}}</a></div>
+            {{/each}}
+        </div>
+    </div>
+</template>

Packages/viewerbase/client/components/viewer/toolbarGroupButton/toolbarGroupButton.styl

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+#toolbarGroupButton
+  .dropdown-menu
+    background-color: black
+    border: solid 1px #333
+    padding: 5px
+    margin-top: 0
+
+    div
+      padding: 5px
+      float: left