[IMP] mass_mailing: graph view for mailing list contacts, customer filters. Added unsubscription / bounce counter on mass mailing contacts
[IMP] pos: correct journal for cash payments

(cherry-pick of 2b08443e0d28e96cbbc9a587cb9932319bd1ce10)
[ADD] added website countdown snippet
[IMP] improved counter, added validation + reload-reset problem
[IMP] replaced snippet thumbnail image with FA
[IMP] anonymous user problem solved
[Add] Added button for switching between counter part and release part
[IMP] configured view-port for countdown timer
[imp] removed unnecessary code, removed date srtring parsing instade of that directly used date object from datepicker
[IMP] solved datepicker's z-index issue