Fixed hundreds of small issues, code improvements, typos, ...

pandalib-ws-server/src/main/java/fr/pandacube/lib/ws/server/AbstractServerWS.java

@@ -61,7 +61,7 @@ public abstract class AbstractServerWS extends WebSocketAdapter implements Abstr
 	}
 
 	@Override
-	public final void sendClose(int code, String reason) throws IOException {
+	public final void sendClose(int code, String reason) {
 		getSession().close(code, reason);
 		isClosed = true;
 	}