v0.7.4

Notable changes:

• Make controls respect Windows animations setting
• Make page transitions more closely match UWP
• Keep text controls in focused state while their context menu is open
• Fix issue where PasswordBox’s context menu didn’t work when PasswordRevealMode was set to Visible
• Fix popup margin when shadow is disabled
• SimpleTimePicker:
  • Improve support for keyboard navigation
  • Enable placeholder text customization