- Refactoring of the mail sending part. Mail queue (table 'queued') is now used also for all test emails.

- More options how to send test emails.
- Fixed problems with pausing a campaign (#593)
- Started rework of transactional sender of templates (#606), however this contains functionality regression at the moment because it does not interpret templates as HBS. It needs HBS option for templates as described in https://github.com/Mailtrain-org/mailtrain/issues/611#issuecomment-502345227

TODO:
- detect sending errors connected to not able to contact the mailer and pause/retry campaing and queued sending - don't mark the recipients as BOUNCED
- add FAILED campaign state and fall into it if sending to campaign consistently fails (i.e. the error with sending is not temporary)
- if the same happends for queued email, delete the message

client/src/lib/form.js

@@ -333,6 +333,13 @@ class InputField extends Component {
 
         const className = owner.addFormValidationClass('form-control', id);
 
+        /* This is for debugging purposes when React reports that InputField is uncontrolled
+        const value = owner.getFormValue(id);
+        if (value === null || value === undefined) console.log(`Warning: InputField ${id} is ${value}`);
+        */
+        const value = owner.getFormValue(id);
+        if (value === null || value === undefined) console.log(`Warning: InputField ${id} is ${value}`);
+
         return wrapInput(id, htmlId, owner, props.format, '', props.label, props.help,
             <input type={type} value={owner.getFormValue(id)} placeholder={props.placeholder} id={htmlId} className={className} aria-describedby={htmlId + '_help'} onChange={evt => owner.updateFormValue(id, evt.target.value)}/>
         );