Implement new media send flow.

Update our media send flow to allow users to send multiple images/videos
at once. This change includes:

- New in-app media picker flow.
- Ability to caption images and videos.
- Image editing tools are made more prominent in the flow.
- Some fixes to the image editing tools.

src/org/thoughtcrime/securesms/jobs/AttachmentUploadJob.java

@@ -29,9 +29,11 @@ import org.whispersystems.signalservice.api.push.exceptions.PushNetworkException
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.net.ConnectException;
 import java.util.concurrent.TimeUnit;
 
 import javax.inject.Inject;
+import javax.net.ssl.SSLException;
 
 import androidx.work.Data;
 import androidx.work.WorkerParameters;
@@ -94,7 +96,9 @@ public class AttachmentUploadJob extends ContextJob implements InjectableType {
 
   @Override
   protected boolean onShouldRetry(Exception exception) {
-    return exception instanceof PushNetworkException;
+    return exception instanceof PushNetworkException ||
+           exception instanceof SSLException         ||
+           exception instanceof ConnectException;
   }
 
   protected SignalServiceAttachment getAttachmentFor(Attachment attachment) {