Modern prestashop starter theme version 2.2.0

Bug fixes:

• fixed filters price/weight slider bug, changing slider value causing to clear all filters,
• gender, birthdate inputs are not longer removed,
• fixed bug that display <ol> just like <ul> with discs instead of decimals,
• email subscription submit button is no longer hidden on mobile,
• product page variants spacing fix,
• product page gallery minor display change

Improvements:

• added possibility to confirm values inside filters slider input by pressing enter key,
• v param added to assets is now being handled with newly created smarty function appendParamToUrl,
• PageSlider complete class refacto and documentation,
• added SwiperSlider class and documentation,
• minor documentation changes (appendParamToUrl, remote assets register)