scalaxb 1.7.5

• Populates xsi:type attribute on toXML(...) #518 by @abestel

• Adds scalaxbUseLists setting to generate List[A] instead of Seq[A] #526 by @pgrandjean

• Fixes code generation to avoid multi-arg infix syntax #531 by @margussipria

• Splits generated fromString method for big enums that would otherwise not compile #517 by @LolHens