chore(style/javadoc): make copyright header as normal comment in all java files -PR#2365
topic/miurahr/header-copyright-normal-comment
Copyright header is not javadoc, but in historical reason, we uses /***** for a first line. This cause javadoc error.
dev-ML discussion
https://sourceforge.net/p/omegat/mailman/message/59361184/ explain it.