Tunnels: Simplify TunnelId and HopConfig to save space

...e/java/src/net/i2p/router/web/helpers/TunnelRenderer.java

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

core/java/test/junit/net/i2p/data/TunnelIdTest.java

.../src/net/i2p/router/tunnel/BatchedRouterPreprocessor.java

router/java/src/net/i2p/router/tunnel/HopConfig.java

...ava/src/net/i2p/router/tunnel/OutboundTunnelEndpoint.java

...c/net/i2p/router/tunnel/ThrottledPumpedTunnelGateway.java

...r/java/src/net/i2p/router/tunnel/TunnelCreatorConfig.java

router/java/src/net/i2p/router/tunnel/TunnelDispatcher.java

router/java/src/net/i2p/router/tunnel/pool/BuildHandler.java

...r/java/src/net/i2p/router/tunnel/pool/BuildRequestor.java

...er/java/test/junit/net/i2p/router/tunnel/InboundTest.java

...r/java/test/junit/net/i2p/router/tunnel/OutboundTest.java

...r/java/test/junit/net/i2p/router/tunnel/RouterITBase.java