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/error-prone-2.11.0/README

@@ -0,0 +1,8 @@
+Error Prone (https://errorprone.info/)
+--------------------------------------
+
+    Version: 2.11.0
+    From: 'Google Inc.' (http://www.google.com/)
+    License(s):
+        Apache v2.0
+

doc/licenses/error-prone-2.11.0/dep-coordinates.txt

@@ -0,0 +1 @@
+com.google.errorprone:error_prone_annotations:jar:2.11.0