Edit as a new email

[hoangdat]

Desc

(CoSoft feedback: don't want to do copy and paste the same message many times)

• Edit as a new email (same with thunderbird)

DoD

• can open an email in composer directly in email list, then edit and send
• can open an email in composer directly when user read this email, then edit and send

Cc: @chibenwa

[chibenwa]

Fully agree.
This will synergise well with the "Template" folder.