[Plugin] Add imported root plugin (#1784)

* [Plugin] Add static root plugin

Add StaticRootPlugin, which allows a file exported with the ImportExport
plugin to be mounted as a static root in Open MCT.  Allows deployers
to configure standard displays for deployments by exporting displays they
have already created.

* Include all src files

src/plugins/plugins.js

@@ -31,7 +31,8 @@ define([
     './summaryWidget/plugin',
     './URLIndicatorPlugin/URLIndicatorPlugin',
     './telemetryMean/plugin',
-    './plot/plugin'
+    './plot/plugin',
+    './staticRootPlugin/plugin'
 ], function (
     _,
     UTCTimeSystem,
@@ -43,7 +44,8 @@ define([
     SummaryWidget,
     URLIndicatorPlugin,
     TelemetryMean,
-    PlotPlugin
+    PlotPlugin,
+    StaticRootPlugin
 ) {
     var bundleMap = {
         CouchDB: 'platform/persistence/couch',
@@ -66,6 +68,8 @@ define([
 
     plugins.ImportExport = ImportExport;
 
+    plugins.StaticRootPlugin = StaticRootPlugin;
+
     /**
      * A tabular view showing the latest values of multiple telemetry points at
      * once. Formatted so that labels and values are aligned.