Parsed palette color strings with RGBA/GdkColor parsing fallbacks for GTK3/GTK2 palette updates.

Adjusted setup RGBA conversion fallback to explicit channel conversion when parsing fails.
Updated GtkCellRendererText foreground property handling for GTK2/GTK3 in user list, DCC list, and notify list rendering.

src/fe-gtk/userlistgui.c

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