settings: Add gtk-long-press-time setting
settings: Add gtk-long-press-time setting

This setting determines the duration of a button/touch press to
be considered a long press.

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