OHIF-333: Split Button (#1988)

* ohif-333: add component foundation

* ohif-333: add expandable content and mocked data

* ohif-333: improve ListMenu component for the new toolbar button and add radio behavior

* ohif-333: add click outside behavior and update primary and secondary props

* ohif-333: separate classes from markup

* ohif-333: fix layout issues

* ohif-333: extract window level component

* ohif-333: update component returns

* ohif-333: update chevron thickness

* ohif-333: remove is active prop

* Delete lerna-debug.log

* ohif-333: clean toolbar and use example in ui package

* ohif-333: update styles to avoid word break

* ohif-333: fix ui package build

Co-authored-by: Erik Ziegler <erik.sweed@gmail.com>
Co-authored-by: Danny Brown <danny.ri.brown@gmail.com>

platform/ui/package.json

@@ -44,8 +44,9 @@
     "react-dnd-touch-backend": "10.0.2",
     "react-dom": "16.11.0",
     "react-draggable": "4.4.3",
-    "react-error-boundary": "2.2.3",
     "react-modal": "3.11.2",
+    "react-error-boundary": "2.2.x",
+    "react-outside-click-handler": "^1.3.0",
     "react-powerplug": "1.0.0",
     "react-select": "3.0.8",
     "theme-ui": "0.2.x"