API: Fix some client-side APIs to honor defaults in Properties;

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnel.java

...2ptunnel/java/src/net/i2p/i2ptunnel/TunnelController.java

...g/java/src/net/i2p/client/streaming/I2PSocketManager.java

...src/net/i2p/client/streaming/I2PSocketManagerFactory.java

.../src/net/i2p/client/streaming/impl/ConnectionOptions.java

...c/net/i2p/client/streaming/impl/I2PSocketManagerFull.java

...c/net/i2p/client/streaming/impl/I2PSocketOptionsImpl.java

core/java/src/net/i2p/client/I2PClient.java

core/java/src/net/i2p/client/I2PSessionImpl.java

core/java/src/net/i2p/data/DataHelper.java

core/java/src/net/i2p/data/i2cp/GetDateMessage.java

core/java/src/net/i2p/data/i2cp/SessionConfig.java

router/java/src/net/i2p/router/TunnelPoolSettings.java

...src/net/i2p/router/client/ClientMessageEventListener.java