Add enums for the custom analytics fields

app/Models/Enums/AnalyticsDimensions.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace App\Models\Enums;
+
+/**
+ * Class AnalyticsDimensions
+ * @package App\Models\Enums
+ */
+class AnalyticsDimensions
+{
+    const PHP_VERSION = 1;
+    const MYSQL_VERSION = 2;
+    const PHPVMS_VERSION = 3;
+}

app/Models/Enums/AnalyticsMetrics.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Models\Enums;
+
+/**
+ * Class AnalyticsMetrics
+ * @package App\Models\Enums
+ */
+class AnalyticsMetrics
+{
+    # Track the lookup time for airports from vaCentral
+    const AIRPORT_LOOKUP_TIME = 1;
+}

modules/Installer/Http/Controllers/InstallerController.php

@@ -2,6 +2,7 @@
 
 namespace Modules\Installer\Http\Controllers;
 
+use App\Models\Enums\AnalyticsDimensions;
 use Log;
 use Irazasyed\LaravelGAMP\Facades\GAMP;
 use Illuminate\Http\Request;
@@ -270,7 +271,7 @@ class InstallerController extends Controller
 
         $gamp = GAMP::setClientId(uniqid('', true));
         $gamp->setDocumentPath('/install');
-        $gamp->setCustomDimension(PHP_VERSION, 1);
+        $gamp->setCustomDimension(PHP_VERSION, AnalyticsDimensions::PHP_VERSION);
         $gamp->sendPageview();
 
         # If analytics are disabled