WIP DO NOT MERGE - First draft at adding email confirmation

[lagoan]

This is the first attempt at adding email confirmation to user accounts.

Right now this change adds:

+ User receives email upon system user creation to confirm email
+ User receives flash notice when trying to log in through the system
stopping them from using it until email is confirmed
+ User account is confirmed after accessing confirmation token url
+ User account goes to resend token view if token expires

What we need to add:

+ Confirm email for SSO accounts
+ Find a way to reset confirmation values for all existing accounts
+ Confirm the translations are present and working in web site and email confirmation
+ More ?

[github-actions[bot]]

	1 Error
:no_entry_sign:	Please include a CHANGELOG entry. You can find it at CHANGELOG.md.

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[lagoan]

@aaronskiba can we remove this PR now ?

[lagoan]

This worked is completed in #923