LED brightness UI (#520)

* Add nouislider

* Add LEDBrightnessComponent

* Move LEDBrightnessComponent to correct folder

* Add LED brightness page to side menu and device routes

* Add LEDBrightnessComponent to device index file

* Add LEDBrightnessComponent and NouisliderModule to shared module

* Remove ngModelChange from LEDBrightnessComponent until onChange is implemented

* Fix stylelint issue in led brightness component

* Add nouislider files to webpack.config.js

* Add adjusting LED brightness sliders with arrow keys

* Various tweaks to LEDBrightnessComponent

* Fix linting issues in LEDBrightnessComponent

* Allow "::ng-deep" pseudo element in stylelint config

* Add reading LED brightness settings from user configuration

* led-brightness save

* Move slider to its own wrapper component, add debounce for slider change events

* Small fixes to imports and exports of SliderWrapperComponent

* Fix slide component making change event when initial value is set

* Export SliderPips interface

* Fix LED Brightness slider pips

* Add support for value unit in SliderWrapperComponent

* Add a bit of space before LED brightness sliders so the slider handle doesn't go beyond the page in the min position

* Implement onDestroy, fix slider pip values and imports in LEDBrightnessComponent

* Fix imports, implement onDestroy in SliderWrapperComponent

* Move fix for slider pip value style to global styles file

* Reorder stylelint rules

packages/uhk-web/src/app/components/slider-wrapper/slider-wrapper.component.html

@@ -0,0 +1,13 @@
+<div class="slider-container">
+    <nouislider
+        [min]="min"
+        [max]="max"
+        [step]="step"
+        [keyboard]="true"
+        [tooltips]="true"
+        [(ngModel)]="value"
+        (ngModelChange)="onSliderChange($event)"></nouislider>
+</div>
+<div class="slider-value">
+    <div class="value-indicator">{{value}} {{valueUnit}}</div>
+</div>