Feature/check latest version (#876)

* Log latest version information

modules/server/src/topics/versiontopic.cpp

@@ -27,6 +27,8 @@
 #include <modules/server/include/connection.h>
 #include <modules/server/servermodule.h>
 #include <openspace/openspace.h>
+#include <openspace/engine/globals.h>
+#include <openspace/util/versionchecker.h>
 
 namespace openspace {
 
@@ -54,6 +56,17 @@ void VersionTopic::handleJson(const nlohmann::json&) {
         }
     };
 
+    if (global::versionChecker.hasLatestVersionInfo()) {
+        VersionChecker::SemanticVersion latestVersion =
+            global::versionChecker.latestVersion();
+
+        versionJson["latestOpenSpaceVersion"] = {
+            { "major", latestVersion.major },
+            { "minor", latestVersion.minor },
+            { "patch", latestVersion.patch }
+        };
+    }
+
     _connection->sendJson(wrappedPayload(versionJson));
 }