Work on refactoring measurements out of Lesion Tracker package

- Removed AssociatedStudies Collection
- Measurement API is generated from configuration files
- Data exchange methods are defined in configuration

Packages/ohif-viewerbase/client/components/viewer/layoutButton/layoutButton.html

@@ -0,0 +1,20 @@
+<template name="layoutButton">
+    <div id="{{this.id}}"
+        class="toolbarSectionButton rp-x-1 {{this.classes}} {{activeClass}} js-dropdown-toggle"
+        title="{{this.title}}"
+        data-target="#layoutChooser"
+    >
+        <div class="svgContainer">
+            {{#if this.svgLink}}
+                <svg>
+                    <use xlink:href={{this.svgLink}}></use>
+                </svg>
+            {{else}}
+                <i class={{iconClasses}}></i>
+            {{/if}}
+        </div>
+        <div class="buttonLabel">
+            {{this.title}}
+        </div>
+    </div>
+</template>