Replaces instances of getBytes() in core classes

core/java/src/com/nettgryppa/security/HashCash.java

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

core/java/src/net/i2p/data/Base32.java

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

core/java/src/net/i2p/util/HexDump.java

...java/test/junit/net/i2p/client/datagram/DatagramTest.java

core/java/test/junit/net/i2p/client/impl/I2PSessionTest.java

core/java/test/junit/net/i2p/crypto/AES256Bench.java

core/java/test/junit/net/i2p/crypto/AESInputStream.java

core/java/test/junit/net/i2p/crypto/AESInputStreamTest.java

core/java/test/junit/net/i2p/crypto/ElGamalTest.java

core/java/test/junit/net/i2p/crypto/HMACSHA256Bench.java

core/java/test/junit/net/i2p/crypto/SHA256Bench.java

core/java/test/junit/net/i2p/crypto/SHA256Test.java

core/java/test/junit/net/i2p/data/Base64Test.java

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

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

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

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

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