fix(hotkeys): Fix the issues with hotkeys (#488)

* wip viewport

* refactoring to do not use dispatch from window

* fixing server active testing

* fix(dependencies): Bump ohif-core to 0.5.5

package.json

@@ -77,7 +77,7 @@
     "hammerjs": "^2.0.8",
     "lodash.isequal": "4.5.0",
     "moment": "^2.24.0",
-    "ohif-core": "0.5.3",
+    "ohif-core": "0.5.5",
     "ohif-cornerstone-extension": "0.0.30",
     "ohif-dicom-html-extension": "^0.0.2",
     "ohif-dicom-microscopy-extension": "^0.0.5",