Factor out remaining Android code from Tor plugin.

bramble-android/build.gradle

.../java/org/briarproject/bramble/plugin/tor/BridgeTest.java

...java/org/briarproject/bramble/test/ApplicationModule.java

...n/java/org/briarproject/bramble/BrambleAndroidModule.java

...roject/bramble/plugin/tor/AndroidCircumventionModule.java

...ject/bramble/plugin/tor/AndroidCircumventionProvider.java

...org/briarproject/bramble/plugin/tor/AndroidTorPlugin.java

...arproject/bramble/plugin/tor/AndroidTorPluginFactory.java

bramble-core/build.gradle

...riarproject/bramble/plugin/tor/CircumventionProvider.java

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

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

...iarproject/bramble/plugin/tor/TorTransportConnection.java

...c/main/java/org/briarproject/briar/android/AppModule.java