make ui_getappdir() and ui_configfile() public newapi

add imageviewer (GTK) newapi

add minimally working image viewer (GTK) newapi

rename gtk image.c to icon.h newapi

add UiGeneric var type newapi

add custom headerbar (GTK) newapi

add new textarea (GTK) newapi

add file icon name fallback (GTK) newapi

implement gtk3 stack tabview newapi

implement stack set/get/remove (GTK) newapi

(0) -300 -100 -10 +10 tip

mercurial