GUACAMOLE-1594: Update all Java and JavaScript dependencies to latest compatible.

NOTE: Several WebPack plugins could not be updated as all plugins within
WebPack's "webpack-contrib" have dropped support for WebPack v4
entirely, but Closure Compiler only supports WebPack v4.

doc/licenses/ksm-sdk-16.4.0/README

@@ -0,0 +1,9 @@
+Keeper Secrets Manager Java SDK
+(https://github.com/Keeper-Security/secrets-manager)
+----------------------------------------------------
+
+    Version: 16.4.0
+    From: 'Keeper Security' (https://www.keepersecurity.com/)
+    License(s):
+        MIT (bundled/ksm-sdk-16.4.0/LICENSE)
+