feat: Add new "Change Editor" option to note context menu (#823)

* feat: add editor icon

* refactor: remove 'any' type and format

* refactor: move NotesOptions and add ChangeEditorOption

* refactor: fix type for using regular RefObject<T>

* feat: add hide-if-last-child util class

* feat: add Change Editor option

* feat: make radio btn gray if not checked

* fix: accordion menu header and item sizing/spacing

* feat: add Escape key to KeyboardKey enum

* refactor: Remove Editor Menu

* feat: add editor select functionality

* refactor: move plain editor name to constant

* feat: add premium editors with modal if no subscription

refactor: simplify menu group creation

* feat: show alert when switching to non-interchangeable editor

* fix: change editor menu going out of bounds

* feat: increase group header & editor item size

* fix: change editor menu close on blur

* refactor: Use KeyboardKey enum & remove else statement

* feat: add keyboard navigation to change editor menu

* fix: editor menu separators

* feat: improve change editor menu sizing & spacing

* feat: show alert only if editor is not interchangeable

* feat: don't show alert when switching to/from plain editor

* chore: bump snjs version

* feat: temporarily remove change editor alert

* feat: dynamically get footer height

* refactor: move magic number to const

* refactor: move constants to constants file

* feat: use const instead of magic number

app/assets/javascripts/views/note_view/note-view.pug

@@ -63,20 +63,6 @@
     .sn-component(ng-if='self.note')
       #editor-menu-bar.sk-app-bar.no-edges
         .left
-          .sk-app-bar-item(
-            click-outside=`self.setMenuState('showEditorMenu', false)`
-            is-open='self.state.showEditorMenu',
-            ng-class="{'selected' : self.state.showEditorMenu}",
-            ng-click="self.toggleMenu('showEditorMenu')"
-            )
-            .sk-label Editor
-            editor-menu(
-              callback='self.editorMenuOnSelect',
-              current-item='self.note',
-              ng-if='self.state.showEditorMenu',
-              selected-editor-uuid='self.state.editorComponentViewer && self.state.editorComponentViewer.component.uuid',
-              application='self.application'
-              )
           .sk-app-bar-item(
             click-outside=`self.setMenuState('showActionsMenu', false)`,
             is-open='self.state.showActionsMenu',