merge newapi

implement new tabview (GTK) newapi

fix file icon and fix crash if a list icon is NULL newapi

fix gtk3 build newapi

fix build newapi

update ucx newapi

improve pathbar visuals (GTK) newapi

implement ui_menuseparator (GTK4) newapi

rename tree.c to list.c (GTK) newapi

add alternative ui_dialog implementation for libadwaita newapi

implement progressbar min/max args (GTK) newapi

fix simple window (libadwaita) newapi

implement ui_savefiledialog name parameter (GTK) newapi

don't add the headerbar to simple windows (GTK) newapi

use GtkFileDialog on newer gtk4 versions newapi

implement file dialog for gtk4 newapi

add option to name widgets and add css classes (GTK) newapi

fix treeview icons (GTK) newapi

implement GTK4 gmenu item and item list newapi

add gtk4 pathbar newapi

add headerbar toggle button (GTK) newapi

simplify gtk button code newapi

make headerbar buttons flat (GTK) newapi

add headerbar (GTK) newapi

simplfy macro usage in container.c (GTK) newapi

fix gtk box margin newapi

fix gtk3/4 grid hexpand/vexpand setting newapi

add libadwaita toolkit option newapi

fix gtk4 checkbox and radiobutton newapi

fix gtk3 build newapi

make gtk4 port compilable newapi

port button, text to gtk4 newapi

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