create email applicants interface

[marcj303]

We would like to send email reminders to applicants in a round. It would be nice to be able to write those emails and set a delivery day/time. This could be done in the rounds interface page, but maybe a generic email interface would be nice as well.

[itsrachelfish]

When this feature is developed it would probably have a lot of shared code with this issue in the volunteer database repo playasoft/volunteers#40

[marcj303]

Email option for admin to send individualized emails to artists:

1. Choose users to autofill email(s) Search options: (grant round), (all, granted, not granted)
2. Choose a saved email prototype to autofill or start new email.
3. Emails have the ability to insert database variable names ex: {username}

After an email is created.
4. Save button - save email text as a prototype option
5. Send button - Sends individual emails in the To: box (not mass email to all)

Typical email interface boxes:

To: (fills in selected emails from search - should be editable)

Subject: {grantround} Application Granted

Message:
Hello {username}
Thanks for applying for {grantround} Your project {projectname} has been granted {grantamount}. Etc.etc.etc.