GtkLabel: Drop use of GtkMisc::x/yalign
GtkLabel: Drop use of GtkMisc::x/yalign

Instead, use GtkWidget::h/valign to position the text inside
the allocation. And just stop using GtkMisc::x/ypad.

https://bugzilla.gnome.org/show_bug.cgi?id=730613

Adamovskiy/gtk,davidgumberg/gtk,Adamovskiy/gtk,alexlarsson/gtk,davidgumberg/gtk,ahodesuka/gtk,Adamovskiy/gtk,Lyude/gtk-,chergert/gtk,Sidnioulz/SandboxGtk,jigpu/gtk,grubersjoe/adwaita,davidgumberg/gtk,grubersjoe/adwaita,jessevdk/gtk,jadahl/gtk,Lyude/gtk-,Sidnioulz/SandboxGtk,jigpu/gtk,jadahl/gtk,alexlarsson/gtk,jadahl/gtk,grubersjoe/adwaita,alexlarsson/gtk,jigpu/gtk,Adamovskiy/gtk,chergert/gtk,ahodesuka/gtk,chergert/gtk,Lyude/gtk-,jadahl/gtk,jigpu/gtk,grubersjoe/adwaita,Lyude/gtk-,grubersjoe/adwaita,ahodesuka/gtk,Sidnioulz/SandboxGtk,Lyude/gtk-,Lyude/gtk-,chergert/gtk,davidgumberg/gtk,jigpu/gtk,grubersjoe/adwaita,jigpu/gtk,Adamovskiy/gtk,davidgumberg/gtk,jessevdk/gtk,jessevdk/gtk,Lyude/gtk-,alexlarsson/gtk,ahodesuka/gtk,jigpu/gtk,grubersjoe/adwaita,chergert/gtk,ahodesuka/gtk,Adamovskiy/gtk,davidgumberg/gtk,Sidnioulz/SandboxGtk,grubersjoe/adwaita,Adamovskiy/gtk,ahodesuka/gtk,Sidnioulz/SandboxGtk,jadahl/gtk,chergert/gtk,chergert/gtk,davidgumberg/gtk,Adamovskiy/gtk,jadahl/gtk,alexlarsson/gtk,chergert/gtk,alexlarsson/gtk,jessevdk/gtk,jadahl/gtk,davidgumberg/gtk,jessevdk/gtk,jessevdk/gtk,jessevdk/gtk,ahodesuka/gtk,alexlarsson/gtk,Lyude/gtk-,jadahl/gtk,Sidnioulz/SandboxGtk,alexlarsson/gtk,jigpu/gtk,ahodesuka/gtk