Moved Exceptions folder in validators #100

Moved from Validators\constraints\Exceptions
to Validators\Exceptions
Add Checkers in order to replace some Validators #100

In Validators\Checks
	-UrlChecker
	-XmlChecker
	-SoapChecker
Implementation of checkers #100

Delete ApiUrlValidator and SoapUrlValidator in HasValidCredentials
Implement Checkers instead of them in HasValidCredentials
Some improvements and phpcs validated #100

Exception changed in method checkReachableUrl in UrlChecker
Condition added in validate in HasValidCredentialsValidator
PhpCS passed
Removal of old unused comments and validators #100
Add translation #100