Add JavaTorPlugin

.../briarproject/bramble/system/AndroidResourceProvider.java

...project/bramble/plugin/tor/CircumventionProviderImpl.java

...n/java/org/briarproject/bramble/plugin/tor/TorPlugin.java

bramble-core/src/main/resources/bridges

bramble-core/src/main/resources/torrc

bramble-j2se/.gitignore

bramble-j2se/build.gradle

...va/org/briarproject/bramble/api/ConfigurationManager.java

.../org/briarproject/bramble/network/JavaNetworkManager.java

...a/org/briarproject/bramble/network/JavaNetworkModule.java

...va/org/briarproject/bramble/plugin/tor/JavaTorPlugin.java

...briarproject/bramble/plugin/tor/JavaTorPluginFactory.java

...va/org/briarproject/bramble/system/JavaLocationUtils.java

...org/briarproject/bramble/system/JavaResourceProvider.java

...ava/org/briarproject/bramble/system/JavaSystemModule.java