feat: Separate lang and currency switch. New template settings to manage this controls #86 #76

feat: New setting --> detatch nav from top and place it initialy by scrolling at the top.

feat: Menu logo has width and height properites.

feat: $Site and $Project are global assigned. No needed to pass it on as params.

feat: HTML structure redesigned.

refactor: README edited.

feat: User icon improved.

refactor: Many small changes.
fix: Search on product search site works.

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feat: Payments control added.

feat: New template settings (show / hide shop categories menu).

#1