Updated setup color dialog RGBA derivation to parse hex palette components with gdk_rgba_parse for GTK3 paths.

Standardized GtkCellRendererText foreground color binding to use the palette foreground property macro across user list, DCC, and notify views.

src/fe-gtk/userlistgui.c

@@ -533,11 +533,7 @@ static void
 userlist_add_columns (GtkTreeView * treeview)
 {
 	GtkCellRenderer *renderer;
-#if GTK_CHECK_VERSION(3,0,0)
-	const char *foreground_property = "foreground-rgba";
-#else
-	const char *foreground_property = "foreground-gdk";
-#endif
+	const char *foreground_property = PALETTE_FOREGROUND_PROPERTY;
 
 	/* icon column */
 	renderer = gtk_cell_renderer_pixbuf_new ();