Email as PDF from TinyMCE

[bobintetley]

A new button to allow emailing as a PDF from within TinyMCE. The email address will be picked up from the person record when generating the document and the default. Clicking it prompts for the email address. A config option in Settings could allow a template to be chosen for sending PDFs via email.

The purpose of this is for sending payment receipts without having to save the document to the media tab first. It would allow users to use the Receipt/Invoice button on a payment tab to generate the receipt, then hit the email as PDF button to send it to the person.