vidaXL Release v3.1.0

FIX The update product price setting option it’s not taken in consideration in all cases when the update price is running
FIX The recognition of products from v2 does not filter non-vidaXL products
FIX Solve the error CRITICAL Uncaught Error: Call to undefined method Woosa\vidaXL\Module_Heartbeat_Hook::schedule()
FIX Solve the error Type error Util::dimension_to_cm number format accepts only float
FEATURE New setting option to use an external cron job instead of the WordPress built-in one