libadwaita 1.0.0-rc.0

Unofficial implementation of Libadwaita Widgets in Flutter.

1.0.0-rc.0

• Seperate libadwaita (Widgets) and adwaita (Colors)
• Rename Every widget from GtkSomething to AdwSomething
• Rename GtkContainer to AdwClamp and GtkTwoPane to AdwFlap
• Add AdwPreferenceGroup and AdwActionRow from libadwaita.
• Add AdwStackSidebar which is basically GtkStackSidebar
• AdwHeaderBar parameter's
  • Replace leading with start
  • Replace trailing with end
  • Replace center with title

For older Changelog visit: https://pub.dev/packages/gtk/changelog