Added more comparison operator overloads for UniqueId
Added more comparison operator overloads for UniqueId

jamie-dainton/MailKit,dsbenghe/MailKit,mganss/MailKit,sstraus/MailKit,matt2003/MailKit,eino-makitalo/MailKit,nachocove/MailKit,jstedfast/MailKit,FubarDevelopment/MailKit,rajeshwarn/MailKit