fix: 🐛 1241: Make Plugin switch part of ToolbarModule (#1322)

* fix: 🐛 Make Plugin switch part of ToolbarModule

Closes: #1241

* Move setCornerstoneViewport command into cornerstone extension

* Exposing extensionManager into extension's get modules functions

* Remove Plugin switch

* Updating set cornerstonelayout to work on VIEWER context

* Creating a customComponent for 2D MPR button

* Use extensionManager to show or not buttons
Adding isHidden option into toolbarModules

* Make buttons hidden depending on extension registration

* Fix unit test after changes on extensionManager

* Remove workaround for extensionManager

* Use studyMeatadataManager and remove TODO's

* Remove storeContext not needed

* Moving Exit 2D MPR into cornerstone extension with VTK context

* Remove PluginSwitch files

* Fix E2E tests

* Adding cypress screenshots into gitignore

* Remove extensionManager from getModuleFn functions and moving CustomComponent for VTK button to VTK extension

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

extensions/cornerstone/src/utils/setCornerstoneLayout.js

@@ -0,0 +1,22 @@
+import { redux } from '@ohif/core';
+
+const { setLayout } = redux.actions;
+
+/**
+ * Update the current layout with a simple Cornerstone one
+ *
+ * @return void
+ */
+const setCornerstoneLayout = () => {
+  const layout = {
+    numRows: 1,
+    numColumns: 1,
+    viewports: [{ plugin: 'cornerstone' }],
+  };
+
+  const action = setLayout(layout);
+
+  window.store.dispatch(action);
+}
+
+export default setCornerstoneLayout;