Added deleting attachments

app/src/main/java/eu/faircode/email/EntityAttachment.java

@@ -31,6 +31,7 @@ import androidx.core.content.FileProvider;
 import androidx.preference.PreferenceManager;
 import androidx.room.Entity;
 import androidx.room.ForeignKey;
+import androidx.room.Ignore;
 import androidx.room.Index;
 import androidx.room.PrimaryKey;
 
@@ -98,6 +99,9 @@ public class EntityAttachment {
     public String media_uri;
     public String error;
 
+    @Ignore
+    public boolean selected = true;
+
     // Gmail sends inline images as attachments with a name and cid
 
     boolean isInline() {