clean up code

DictionaryManager.java try-with-resouces introduced

DictionaryManager.installRemoteDictionary enhanced

code duplicates fixed in FilterMaster.java, Handler.java, TaaSClient.java, SegmentationCustomizer.java, StaticUtils.java, TMXReaderTest.java

CreateGlossaryEntry.java translation field got focuse

ExternalTMXMatchesDialog.java apply system font

ClipboardDialog improved

ProxyUtils.java introduced

StaticUtils improved and now uses proxy

StringTransferHandler moved into separate class