Merge branch '1720-no-acra' into 'master'

Remove ACRA and implement the few bits we need ourselves

Closes #1114, #1720, and #1793

See merge request briar/briar!1319

bramble-api/src/main/java/org/briarproject/bramble/api/reporting/DevReporter.java

@@ -23,6 +23,8 @@ public interface DevReporter {
 
 	/**
 	 * Sends any reports previously stored on disk.
+	 *
+	 * @return The number of reports that were sent.
 	 */
-	void sendReports();
+	int sendReports();
 }