Imagery Age to be displayed for realtime mode in Imagery View (#3308)

* fix linting errors

* removing testing units

* WIP: stubbe in age in template, adding getAge function

* WIP: stubbed in age in template, dummy function to start

* added image age for realtime mode, ready for styling

* reverting unnecesarry telemetryview file changes, not needed for this issue

* checking for age tracking conditions on mount

* Image age styling and changes

- Cleaned up code in ImageryPlugin to use const instead of var, changed
image delay time into a const

* Image age styling and changes

- WIP!
- Layout changes for Imagery control-bar;
- New animation effect, WIP;

* Image age styling and changes

- Markup and CSS updates for Imagery view;
- Final layout for age indicator;

* parsing image timestamp in case it is a string

* using moment for human readable durations above 8 hours

* UTC based timesystem check

* reset "new" css class on image age when "time" updates

* WIP: debuggin weird imagery plugin issue for first selection of image in thumbnails

* fixing pause overwriting clicked images selection

* making isImageNew a computed value

* WIP: pr updates

* WIP: tabling PR edits to focus on lower hanging PR edits for testathon

* WIP

* overhaul of imagery plugin logic for optimization PLUS imagery age

* adding next/prev functionality to refactored plugin

* added arrow left and right keys to navigate next and previous

* added arrow key scrolling and scrolling thumbnail into view and hold down scrolling

* adding in missing class

* component based key listening, PR updates

* refactor to use just imageIndex to track focused image, utilized more caching, PR comment edits

Co-authored-by: David Tsay <david.e.tsay@nasa.gov>
Co-authored-by: charlesh88 <charlesh88@gmail.com>

example/imagery/plugin.js

@@ -27,7 +27,7 @@ define([
 ) {
     function ImageryPlugin() {
 
-        var IMAGE_SAMPLES = [
+        const IMAGE_SAMPLES = [
             "https://www.hq.nasa.gov/alsj/a16/AS16-117-18731.jpg",
             "https://www.hq.nasa.gov/alsj/a16/AS16-117-18732.jpg",
             "https://www.hq.nasa.gov/alsj/a16/AS16-117-18733.jpg",
@@ -47,13 +47,14 @@ define([
             "https://www.hq.nasa.gov/alsj/a16/AS16-117-18747.jpg",
             "https://www.hq.nasa.gov/alsj/a16/AS16-117-18748.jpg"
         ];
+        const IMAGE_DELAY = 20000;
 
         function pointForTimestamp(timestamp, name) {
             return {
                 name: name,
-                utc: Math.floor(timestamp / 5000) * 5000,
-                local: Math.floor(timestamp / 5000) * 5000,
-                url: IMAGE_SAMPLES[Math.floor(timestamp / 5000) % IMAGE_SAMPLES.length]
+                utc: Math.floor(timestamp / IMAGE_DELAY) * IMAGE_DELAY,
+                local: Math.floor(timestamp / IMAGE_DELAY) * IMAGE_DELAY,
+                url: IMAGE_SAMPLES[Math.floor(timestamp / IMAGE_DELAY) % IMAGE_SAMPLES.length]
             };
         }
 
@@ -64,7 +65,7 @@ define([
             subscribe: function (domainObject, callback) {
                 var interval = setInterval(function () {
                     callback(pointForTimestamp(Date.now(), domainObject.name));
-                }, 5000);
+                }, IMAGE_DELAY);
 
                 return function () {
                     clearInterval(interval);
@@ -81,9 +82,9 @@ define([
                 var start = options.start;
                 var end = Math.min(options.end, Date.now());
                 var data = [];
-                while (start <= end && data.length < 5000) {
+                while (start <= end && data.length < IMAGE_DELAY) {
                     data.push(pointForTimestamp(start, domainObject.name));
-                    start += 5000;
+                    start += IMAGE_DELAY;
                 }
 
                 return Promise.resolve(data);