Exported the ParseTemplateFile method located in email.go from notificationmdl for introducing the feature "Email Template Selection from Local Disk"

replyTo feature added

1. Fix: Email text types for boly and plain body

1. Fix: Sent email is plain text if alternate text is empty
2. Add: Parse Plain text in normal v2 call

1. Add: Method to parse and set plainbody

1. Add: Method to add alternate text fro email

1. Add: Message Id header to avoid spam mails

notidicationmdl-Email- plain mail,html handlebar mail support
securitymdl-GetHash and GetHashAndSalt methods added