Use FortunaGenerator to implement PseudoRandom.

...r-android/src/org/briarproject/android/AndroidModule.java

...ndroid/src/org/briarproject/android/PasswordActivity.java

...r-android/src/org/briarproject/android/SetupActivity.java

briar-api/src/org/briarproject/api/crypto/SecretKey.java

briar-api/src/org/briarproject/api/db/DatabaseConfig.java

...core/src/org/briarproject/crypto/CryptoComponentImpl.java

briar-core/src/org/briarproject/crypto/PseudoRandomImpl.java

briar-core/src/org/briarproject/db/H2Database.java

briar-tests/src/org/briarproject/TestDatabaseConfig.java