[Validator] Added IBAN validator

Validation for International Bank Account Numbers

Signed-off-by: Manuel Reinhard <manu@sprain.ch>

Fixed according to coding standards, hopefully

Signed-off-by: Manuel Reinhard <manu@sprain.ch>

Moved strlen out of loop

Signed-off-by: Manuel Reinhard <manu@sprain.ch>

Coding Standards …

Signed-off-by: Manuel Reinhard <manu@sprain.ch>