Gravity Perks - Conditional Logic Dates 1.2.17

Updated frontend JS to handle the date selection requirement for conditional logic evaluation to match how it is handled by PHP.
Added JS and PHP hook "gpcld_require_date_selection" to disable date selection requirement for conditional logic evaluation.

-Fixed issue when validating dates in January.

Fixed issue with GP Limit Dates where inline datepickers used in conditional logic did not evaluate correctly.