[Darkmatter] Create new darkmatter theme (#7682)

* initial theme plugin setup, changes to layout frames

* update visual tests

* Changes to gauge, layout borders, and background

* Make background image a DIY theme variable. Fixes made to gauges. Deleted custom font.

* More changes to overall background colors. Added glass layer effect to menus

* changes to menu

* Fix to make theme easy to run

* Fix tab colors and add glass background to menus

* make highlightd corners longer

* Initial changes to font styles

* Add temporary numeric font style. Test numeric font in gauges.

* Initial changes to alphanumerics in layouts

* Updated variables

* update plugin.js file

* Fix highlighted corners on frames such that it uses outermost frame

* renaming theme plugin and rename branch

* fix button colors to be more readable

* change background image

* Fix bad merges from other theme files. Fix gauge and alphanumerics such that they dont have darkmatter borders

* more fixes

* Fix where mixin is used such that when an object's frame is hidden, highlgihts disappear

* remove blur from meter gauges

* Add comment about this theme being in beta mode

* Delete draft .scss file that is no longer needed

* Fix major accessibility issues

* Fix PR review comments

* ✨ fix: Correct import file name for DarkMatter theme.

* Fix other theme code that was failing e2e tests

* Revert index.html

* Fix linting error

* Fix for failing percy test regarding padding

* Fix for failing percy test regarding padding part 2

* Fix for failing percy test regarding padding part 3

* Remove mixin that may be causing percy issue

* Another fix to resolve percy issue

* Add back some code that was deleted during debugging, and create new variables for the object padding

* Fix gradient clipping in inspector

* Restructure all constants-.scss files

* Change bg image to be square and NASA official picture

* Final fixes to darkmatter variable layouts

* Address PR comments

* Change darkmatter to darkmatterTheme

---------

Co-authored-by: John Hill <john.c.hill@nasa.gov>
Co-authored-by: Jesse Mazzella <jesse.d.mazzella@nasa.gov>

src/plugins/displayLayout/components/telemetry-view.scss

@@ -18,6 +18,7 @@
   }
 
   &__value {
+    @include telemetryView();
     @include isLimit();
   }