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/studyBrowser/imageThumbnail/imageThumbnail.styl

@@ -0,0 +1,49 @@
+@import "{design}/app"
+
+.thumbnailEntry.active .imageThumbnail
+  theme('border-color', '$activeColor')
+  box-shadow: none
+  transition($sidebarTransition)
+
+.imageThumbnail
+  theme('box-shadow', 'inset 0 0 0 1px $uiBorderColorDark')
+  theme('background-color', '$primaryBackgroundColor')
+  border: 5px solid transparent
+  border-radius: 12px
+  height: 135px
+  margin: 0 auto
+  padding 1px 7px
+  position: relative
+  transition($sidebarTransition)
+  width: 217px
+  -moz-background-clip: padding
+  -webkit-background-clip: padding
+  background-clip: padding-box
+
+.imageThumbnailClone
+  margin: 0 !important
+
+  &:hover
+    theme('border-color', '$hoverColor')
+    box-shadow: none
+
+.imageThumbnailCanvas
+  height: 100%
+  overflow: hidden
+
+.thumbnailLoadingIndicator
+  display: none
+  pointer-events: none
+  theme('color', '$textSecondaryColor')
+  height: 20px
+  width: 100%
+  top: 0
+  left: 0
+  right: 0
+  bottom: 0
+  margin: auto
+  position: absolute
+
+  p
+    text-align: center
+    font-size: 10pt