move the server code to its own module - just like the commandline module; this makes sense as it has its own Main class (actually two - we default to the HTTPS one)

git-svn-id: https://languagetool.svn.sourceforge.net/svnroot/languagetool/trunk/languagetool@9466 2fe6a88b-1217-0410-b804-ba6ed01314b8