Resetting the app after deletion and cleanup settings (#372)

* Fixes #361 - Reset everything if the app has been deleted since the last run

* Cleaned up and renamed the ElementSettings to ApplicationSettings. Removed its singleton and moved it to the service locator.

* Moved the ApplicationSettings to the Application folder

* Merged together the BuildSettings and ApplicationSettings

* Reset the UserDefaults too when resetting the application state

* Rename ServiceLocator.applicationSettings to just settings

* Fix indentation

* Rename ApplicationSettings to AppSettings

* Various tweaks following code review

* Fix unit tests

ElementX/Sources/Services/UserSession/UserSessionStore.swift

@@ -36,6 +36,12 @@ class UserSessionStore: UserSessionStoreProtocol {
         MXLog.debug("Setup base directory at: \(baseDirectory)")
     }
     
+    /// Deletes all data stored in the shared container and keychain
+    func reset() {
+        try? FileManager.default.removeItem(at: baseDirectory)
+        keychainController.removeAllRestorationTokens()
+    }
+    
     func restoreUserSession() async -> Result<UserSession, UserSessionStoreError> {
         let availableCredentials = keychainController.restorationTokens()