feat: 🎸 Update hotkeys and user preferences modal (#1135)

* feat: 🎸 Update hotkeys and user preferences modal

This feature fix incompatibility with existent hotkeys component and
adds user preferences modal back

Closes: #923

* Update preferences structure in store

* Hide window level section of user preferences

* Update modal to reflect current hotkey value

* Clone object with hotkeys before passing to manager

* CR Update: Extract hotkeys manager format code to manager

* Fix broken cypress test

* Use new modal provider

* Rename hotkeyDefinitions in hotkeyspreferences and use array as representation

* Update study test and remove unused styles

platform/viewer/src/components/Header/Header.css

@@ -4,6 +4,10 @@
   height: var(--top-bar-height);
 }
 
+.dd-item {
+  width: 100%;
+}
+
 /* Home Page */
 .entry-header.header-big {
   background: rgba(21, 25, 30, 0.7);