Implement lifecycle method for wiping the mailbox

...java/org/briarproject/mailbox/android/MailboxViewModel.kt

...ain/java/org/briarproject/mailbox/android/MainFragment.kt

mailbox-android/src/main/res/layout/fragment_main.xml

mailbox-android/src/main/res/values/strings.xml

...rc/main/java/org/briarproject/mailbox/core/db/Database.kt

.../main/java/org/briarproject/mailbox/core/db/H2Database.kt

...ain/java/org/briarproject/mailbox/core/db/JdbcDatabase.kt

...n/java/org/briarproject/mailbox/core/files/FileManager.kt

...briarproject/mailbox/core/lifecycle/LifecycleManager.java

...iarproject/mailbox/core/lifecycle/LifecycleManagerImpl.kt

...main/java/org/briarproject/mailbox/core/server/Routing.kt

.../org/briarproject/mailbox/core/server/WebServerManager.kt

...n/java/org/briarproject/mailbox/core/setup/WipeManager.kt

.../test/java/org/briarproject/mailbox/core/TestComponent.kt

...src/test/java/org/briarproject/mailbox/core/TestModule.kt

...t/mailbox/core/contacts/ContactsManagerIntegrationTest.kt

.../contacts/ContactsManagerMalformedInputIntegrationTest.kt

...va/org/briarproject/mailbox/core/db/TestDatabaseModule.kt

...t/java/org/briarproject/mailbox/core/db/TestH2Database.kt

...rproject/mailbox/core/files/FileManagerIntegrationTest.kt