* added regulation validator
* made regulations find_time and ban_time values duration notation strings
* added DefaultRegulationConfiguration for the validator
* made session expiration and inactivity values duration notation strings
* TOTP period does not need to be converted because adjustment should be discouraged
* moved TOTP defaults to DefaultTOTPConfiguration and removed the consts
* arranged the root config validator in configuration file order
* adjusted tests for the changes
* moved duration notation docs to root of configuration
* added references to duration notation where applicable
* project wide gofmt and goimports:
* run gofmt
* run goimports -local github.com/authelia/authelia -w on all files
* Make jwt_secret error uniform and add tests
* now at 100% coverage for internal/configuration/validator/configuration.go
Instead of checking the value of the cookie expiration we rely
on the boolean stored in the user session to check whether inactivity
timeout should be disabled.
Authelia needs to know with what IP was the request originating in
order to apply network based ACL rules. Authelia already supported
X-Forwarded-For but X-Real-IP is another way to define it. It takes
precedence over X-Forwarded-For.
