Princess Charlotte will potentially become “the Princess Royal’ one day when her father, Prince William, is the monarch. This has many royal analysts excited by the news of the current title holder, Princess Anne, giving her great-niece a crash course in how to perform in the position. “Anne’s ‘training,’ if you will, isn’t just about rank, file, and curtsies either,” a source shared. “She’s shown her how to spark conversations, but also how to end one and move on without upsetting anyone.” “That was a tough one for Kate to learn, but Charlotte was born to royalty so is used to the subtle sign…