Better handling of InterruptedExceptions.

components/net/sf/briar/db/DatabaseCleanerImpl.java

components/net/sf/briar/db/DatabaseExecutorImpl.java

components/net/sf/briar/db/JdbcDatabase.java

...ts/net/sf/briar/lifecycle/WindowsShutdownManagerImpl.java

components/net/sf/briar/plugins/PollerImpl.java

...nents/net/sf/briar/plugins/bluetooth/BluetoothPlugin.java

...ts/net/sf/briar/plugins/bluetooth/ConnectionCallback.java

...nents/net/sf/briar/plugins/bluetooth/ContactListener.java

...ts/net/sf/briar/plugins/bluetooth/InvitationListener.java

components/net/sf/briar/plugins/file/FileListener.java

components/net/sf/briar/plugins/file/FilePlugin.java

...t/sf/briar/plugins/file/PollingRemovableDriveMonitor.java

...nents/net/sf/briar/protocol/VerificationExecutorImpl.java

components/net/sf/briar/transport/FrameScheduler.java

...onents/net/sf/briar/transport/PaddedConnectionWriter.java

...nents/net/sf/briar/transport/stream/StreamConnection.java