Add variable for controlling validation
Add variable for controlling validation

Supported values are:
	* StrictValidation
	* LenientValidation
	* SkipInvalid

StrictValidation   requires that everything is properly formatted.
LenientValidation  allows optional elements to have an invalid format.
SkipInvalid        allows entire subtitles to be in an invalid format,
                   skipping the invalid rows. Will result in data loss..

n00bDooD/gosrt