Add popdown toolbutton to files-dock-window toolbar. * libgui/src/files-dock-widget.cc (files_dock_widget::files_dock_widget): added popdown button to toolbar and merged set current dir, show current dir into it as well as adding new dir and new file option. (files_dock_widget::display_directory): change to call process_set_current_dir instead of emit. (files_dock_widget::contextmenu_newfile): change to call process_new_file. (files_dock_widget::contextmenu_newdir): Change to call process_new_dir. (files_dock_widget::contextmenu_setcurrentdir): Change to call process_set_current_dir. (files_dock_widget::popdownmenu_newdir): New function. (files_dock_widget::popdownmenu_newfile): New function. (files_dock_widget::process_new_file): New function. (files_dock_widget::process_new_dir): New function. (iles_dock_widget::process_set_current_dir): New function. * libgui/src/resource.qrc: Added icons/gear.png. * libgui/src/module.mk: Added icons/gear.png. * libgui/src/icons.png: New file.