Encrypt and save crash reports, send them the next time TorPlugin start

Will currently fail at runtime; requires a public key and a server onion.

briar-api/src/org/briarproject/api/reporting/DevConfig.java

@@ -0,0 +1,10 @@
+package org.briarproject.api.reporting;
+
+public interface DevConfig {
+
+	byte[] getDevPublicKey();
+
+	String getDevOnionAddress();
+
+	int getDevReportPort();
+}

briar-api/src/org/briarproject/api/reporting/DevReporter.java

@@ -0,0 +1,28 @@
+package org.briarproject.api.reporting;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+
+/**
+ * A task for reporting back to the developers.
+ */
+public interface DevReporter {
+
+	/**
+	 * Store a crash report encrypted on-disk to be sent later.
+	 *
+	 * @param crashReportDir the directory where crash reports are stored.
+	 * @param crashReport    the crash report in the form expected by the server.
+	 * @throws FileNotFoundException if the report could not be written.
+	 */
+	void encryptCrashReportToFile(File crashReportDir, String crashReport)
+			throws FileNotFoundException;
+
+	/**
+	 * Send crash reports previously stored on-disk.
+	 *
+	 * @param crashReportDir the directory where crash reports are stored.
+	 * @param socksPort      the SOCKS port of a Tor client.
+	 */
+	void sendCrashReports(File crashReportDir, int socksPort);
+}