Redesign configuration method

[nblumhardt]

WriteTo.Email() needs a refresh, after many years of incremental additions.

This PR renames and reorganizes the configuration options to bring them up to a reasonable standard.

Parameter	Description
from	The email address emails will be sent from.
to	The email address emails will be sent to. Multiple addresses can be separated with commas or semicolons.
host	The SMTP server to use.
port	The port used for the SMTP connection. The default is 25.
connectionSecurity	Choose the security applied to the SMTP connection. This enumeration type is supplied by MailKit. The default is Auto.
credentials	The network credentials to use to authenticate with the mail server.
subject	A message template describing the email subject. The default is "Log Messages".
body	A message template describing the format of the email body. The default is "{Timestamp} [{Level}] {Message}{NewLine}{Exception}".
formatProvider	Supplies culture-specific formatting information. The default is to use the current culture.

[nblumhardt]

Liking the net462;netstandard2.0;net6.0 TFM combo 👍