Renamed functions with vendorAccount parameter to mintXVendors and redeemXVendors
Added functions mintX and redeemX for retrocompatibility. These functions call the respective functions named in previous item, and pass address(0) as vendorAccount parameter
Added test for retrocompatible functions
Modified existing tests and test helpers in order to adapt them for new functions and retrocompatibility
vendorAccountparameter tomintXVendorsandredeemXVendorsmintXandredeemXfor retrocompatibility. These functions call the respective functions named in previous item, and passaddress(0)asvendorAccountparameter