forked from SoDOff-Project/sodoff

* add support for old missions API (aka "steps missions") * config option to disable loading non SoD Data (used only for missions and achievements for now) * make AuthenticateUser endpoint compatible with games that use e-mail as login * add api keys for lands * add GetGameCurrency endpoint * allow create empty stores and add store "8" (empty) --------- Co-authored-by: Robert Paciorek <robert@opcode.eu.org>