[NEW MODULE] Additions for eCommerce under German Law

This addon installed necessary additions in accordance with statutory requirements in Germany.

Overview
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 - adds terms page
 - adds revocation page
 - adds delivery page
 - adds privacy page
 - adds imprint page
 - adds an easy built-in address snippet to content blocks
 - adds "incl. VAT, plus shipping costs" to every price - adds terms and revocation popup on payment site; both are taken from terms and revocation page on the frontend