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/kotlinx-serialization-1.3.3/NOTICE.txt

@@ -0,0 +1,2 @@
+kotlinx.serialization library.
+Copyright 2017-2019 JetBrains s.r.o and respective authors and developers

doc/licenses/kotlinx-serialization-1.3.3/README

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+Kotlin Serialization (https://github.com/Kotlin/kotlinx.serialization)
+----------------------------------------------------------------------
+
+    Version: 1.3.3
+    From: 'JetBrains s.r.o and respective authors and developers'
+    License(s):
+        Apache v2.0
+

doc/licenses/kotlinx-serialization-1.3.3/dep-coordinates.txt

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+org.jetbrains.kotlinx:kotlinx-serialization-json-jvm:jar:1.3.3
+org.jetbrains.kotlinx:kotlinx-serialization-core-jvm:jar:1.3.3