Create or integrate communication mechanism

Story descriptions:

1.9 As a submitter I want to notify Europe PMC that my grant isn't in the system
1.13 As a submitter I want to write a note to the reviewer so that they have context about the submission
3.1 As a reviewer I want to email a personal note to my submitter about the task
3.2 As a reviewer I want to notify the submitter of corrections e.g. the manuscript is the wrong *version or a figure is missing
3.5 As a submitter or reviewer I want to ask EPMC Admin a question during my review
5.12 As an admin or external QA I want to be able to notify the submitter of any missing files or figures

Acceptance criteria:

• Funding: The submitter should be invited/allowed to inform Europe PMC of missing grants or problems with the embargo date. The submitter should be invited/allowed to write a message to the selected reviewer.
• Review & Edit: A tool should allow communication/recording of messages between all user types, and should provide the admin specifically with editable email templates based upon error selections.

Subtasks:

• #147 (closed) Create mechanism to send email
• Allow users to write email in "select reviewer" step
• Allow admin to write email in QA step
• Allow reviewers to write email to submitters in review step
• Update data storage to store email messages sent in history for manuscript
• Create (or use someone else's?) chat tool
• Create "Contact Helpdesk" chat/email component replaced with new ticket