(GH-3587) MetroTabControl
(GH-3587) MetroTabControl

- Rename MahApps.Templates.MetroTabControl.KeepVisualTreeInMemoryWhenChangingTabs to MahApps.Templates.MetroTabControl.KeepVisualTreeInMemory
- Rename MahApps.Templates.MetroTabControl.DoNotKeepVisualTreeInMemoryWhenChangingTabs to MahApps.Templates.MetroTabControl.DoNotKeepVisualTreeInMemory

batzen/MahApps.Metro,ye4241/MahApps.Metro,MahApps/MahApps.Metro