[Feature] A User of Purify can change their email address

[ylorgat]

Is your feature request related to a problem? Please describe.
As an owner/admin I find it difficult to do micro user management and would like to fix this,
Sometimes I accidentally type someone's username/email wrong into the user creation section

Describe the solution you'd like
Within my account the user logs in with the wrong email address for the first time. They can then go into their Purify Account and change their email address to the correct one