cleanup: annotated a bunch of files

core/java/src/net/i2p/I2PException.java

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

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

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

core/java/src/net/i2p/client/I2PClientImpl.java

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

core/java/src/net/i2p/client/I2PSessionImpl2.java

...java/src/net/i2p/client/MessagePayloadMessageHandler.java

.../java/src/net/i2p/client/MessageStatusMessageHandler.java

...ava/src/net/i2p/client/RequestLeaseSetMessageHandler.java

.../java/src/net/i2p/client/SessionStatusMessageHandler.java

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

...ava/src/net/i2p/client/naming/AddressDBNamingService.java

core/java/src/net/i2p/client/naming/DummyAddressDB.java

core/java/src/net/i2p/client/naming/DummyNamingService.java

core/java/src/net/i2p/client/naming/EepGetNamingService.java

core/java/src/net/i2p/client/naming/ExecNamingService.java

core/java/src/net/i2p/client/naming/FilesystemAddressDB.java

...java/src/net/i2p/client/naming/HostsTxtNamingService.java

core/java/src/net/i2p/client/naming/MetaNamingService.java