Indicators api (#1837)

* [API] Added Indicators API

* [Indicators] Converted Follow Indicator to new Indicators API

* [Indicators] Converted URL Indicator to new Indicators API

* [Indicators] Changes to some legacy indicators for compatibility with new Indicators API

* [Indicators] Addressed code review items from https://github.com/nasa/openmct/pull/1837

* Updated tests for URL Indicator

* Adding Indicator API spec

* Address linting issues

* Switched to direct DOM manipulation rather than template compilation to avoid an unnecessary extra holder element

* Updated documentation to reflect changes to API

* Indicators api styling (#2076)

Updated styling for Indicators

* Update API TOC

* Fix color of items w-mct-example areas of Style Guide

Fixes #1837

* Status class refactoring and cleanups

Fixes #1837
- Significant cleanups and name refactoring to allow more
concise selector definitions, with changes in js, html and scss files;
- Updates in Style Guide > Status page, with some content
reorganization and clarification;

* Corrected out of date API

* de-zeptoed Indicator API test spec

* Remove promise from URLIndicator

* Separated legacy indicators support

* Updated Indicator specs to Jasmine 3

* Fixed checkstyle and lint issues

* Moved legacy indicators support to adapter folder

* Various fixes for Indicators

Fixes #1837
- Added SASS constants for Indicator colors;
- Removed commented code;
- Removed unused indicator classes from _messages.scss
- Fixed missing s-status-on class;

* Significant revisions to Style Guide Indicators content

Fixes #1837
- Better documentation including recommendations;
- Better and more concrete examples;

* Style Guide example tweaks

Fixes #1837

* Refinement to Style Guide Status and Limits content

Fixes #1837
- More detail and clarification on Status and Limits;

* Cleanup code

Fixes #1837
- Remove commented styles;
- Line return refinements;

example/identity/src/ExampleIdentityService.js

@@ -55,21 +55,37 @@ define(
          * @implements {IdentityService}
          * @memberof platform/identity
          */
-        function ExampleIdentityProvider(dialogService) {
-            // Handle rejected dialog messages by treating the
-            // current user as undefined.
-            function echo(v) { return v; }
-            function giveUndefined() { return undefined; }
+        function ExampleIdentityProvider(dialogService, $q) {
+            this.dialogService = dialogService;
+            this.$q = $q;
 
-            this.userPromise =
-                dialogService.getUserInput(DIALOG_STRUCTURE, DEFAULT_IDENTITY)
-                    .then(echo, giveUndefined);
+            this.returnUser = this.returnUser.bind(this);
+            this.returnUndefined = this.returnUndefined.bind(this);
         }
 
         ExampleIdentityProvider.prototype.getUser = function () {
-            return this.userPromise;
+            if (this.user) {
+                return this.$q.when(this.user);
+            } else {
+                return this.dialogService.getUserInput(DIALOG_STRUCTURE, DEFAULT_IDENTITY)
+                    .then(this.returnUser, this.returnUndefined);
+            }
         };
 
+        /**
+         * @private
+         */
+        ExampleIdentityProvider.prototype.returnUser = function (user) {
+            return this.user = user;
+        }
+
+        /**
+         * @private
+         */
+        ExampleIdentityProvider.prototype.returnUndefined = function () {
+            return undefined;
+        }
+
         return ExampleIdentityProvider;
     }
 );