Move integration tests to their proper packages

bramble-core/build.gradle

...va/org/briarproject/bramble/sync/SyncIntegrationTest.java

...iarproject/bramble/sync/SyncIntegrationTestComponent.java

briar-android-tests/.gitignore

briar-android-tests/build.gradle

briar-android-tests/src/main/AndroidManifest.xml

briar-android-tests/src/main/res/values/strings.xml

briar-android/build.gradle

briar-core/build.gradle

...est/java/org/briarproject/briar/BriarIntegrationTest.java

...org/briarproject/briar/BriarIntegrationTestComponent.java

...g/briarproject/briar/blog/BlogManagerIntegrationTest.java

...t/java/org/briarproject/briar/forum/ForumManagerTest.java

...oject/briar/introduction/IntroductionIntegrationTest.java

...ar/introduction/IntroductionIntegrationTestComponent.java

...arproject/briar/messaging/MessageSizeIntegrationTest.java

.../briar/messaging/MessageSizeIntegrationTestComponent.java

...ject/briar/messaging/SimplexMessagingIntegrationTest.java

...r/messaging/SimplexMessagingIntegrationTestComponent.java

...ct/briar/privategroup/GroupInvitationIntegrationTest.java