Integration tests for mailbox using mailbox-lib as submodule

.gitlab-ci.yml

.gitmodules

...Configurations/All_tests_in_mailbox_integration_tests.xml

.../java/org/briarproject/bramble/mailbox/MailboxModule.java

...n/java/org/briarproject/bramble/mailbox/UrlConverter.java

.../org/briarproject/bramble/mailbox/UrlConverterModule.java

bramble-core/src/test/bash/wait-for-mailbox.sh

...mble/contact/ContactExchangeIntegrationTestComponent.java

...e/plugin/file/RemovableDriveIntegrationTestComponent.java

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

...roject/bramble/test/BrambleCoreIntegrationTestModule.java

...project/bramble/test/BrambleIntegrationTestComponent.java

...est/java/org/briarproject/bramble/test/FakeTorPlugin.java

.../briarproject/bramble/test/FakeTorPluginConfigModule.java

...a/org/briarproject/bramble/test/FakeTorPluginFactory.java

...ansport/agreement/TransportKeyAgreementTestComponent.java

...main/java/org/briarproject/bramble/BrambleJavaModule.java

...ect/bramble/test/BrambleJavaIntegrationTestComponent.java

.../org/briarproject/briar/android/BriarUiTestComponent.java

.../org/briarproject/briar/android/BriarUiTestComponent.java