Context-Menu for Tables (#2424)

* add context menu capability to table rows, add view switcher to preview

* add an option to limit context menu actions to the ones requested, and modify preview action to also include a view historical data action

* extend preview action into view historical data action

* add context menu to LAD Table

* add keys to context menu actions, allow tables to conditionally attach context menu handler

* working switch y axis label

* New vertical select element for Y axis configuration in plots

- CSS for vertically rotated selects for Y axis label selection;
- New theme constants;
- Removed themedSelect theme mixins;
- New SASS svgColorFromHex function;

* use keys in lad table context menu options

* show historical view context menu on alpha-numerics

* make reviewer requested changes

* pass contextual object path from object view down etc

* made reviewer requested changes: removed options object, pass in object path instead

* remove redundant function from LADRow.vue

src/plugins/displayLayout/components/DisplayLayout.vue

@@ -202,7 +202,7 @@
                 return selectionPath && selectionPath.length > 1 && !singleSelectedLine;
             }
         },
-        inject: ['openmct', 'options'],
+        inject: ['openmct', 'options', 'objectPath'],
         props: ['domainObject'],
         components: components,
         methods: {