Can preset transport security settings
by default set username and password for both imap and smtp
configurations
Only when provider is custom smtp and imap can be configured

Every step needs to decide if it can be activated or not. Default here
is YES. IMAP and SMTP can be configured only if provider is custom.
The Wizard controller automatically skips steps which can't be activated
Added finish step
Set next-button title if it is last step or not
also manage account color