Remove uses of obsolete conversion functions
Remove uses of obsolete conversion functions

gkoz/rust-gnome-gtk,gkoz/gtk-rs-gtk,Susurrus/gtk,rust-gnome/gtk,daa84/gtk,Susurrus/gtk,EPashkin/rust-gnome-gtk,gkoz/rust-gnome-gtk,gkoz/gtk-rs-gtk,daa84/gtk,EPashkin/rust-gnome-gtk,rust-gnome/gtk