Raising the Java version to 11

[Pedro F. Giffuni via dev]

Hello;
I have this idea that OpenOffice should be leaner so I have a patch for 
MediaWiki that replaces a bunch of old Java dependencies with JVM functionality.
commons-httpclient --> java.net.http.HttpClientcommons-codec -->  
java.util.Base64 / HexFormatcommons-logging --> java.util.logging / AOO 
loggingcommons-lang3 --> JDK equivalents
The downside: we will now require Java 11+. I think nowadays this is a pretty 
reasonable requirement though. Any comments?
Pedro.