fix broken icon path after new icon structure in GUI * community-news.cc: use window icon configured in the preferences * documentation-dock-widget.cc (documentation_dock_widget) * files-dock-widget.cc (files_dock_widget) * history-dock-widget.cc (history_dock_widget) * terminal-dock-widget.cc (terminal_dock_widget) * variable-editor.cc (variable_editor) * workspace-view.cc (workspace_view) do not set window icon here as it is set in the main window * gui-preferences-dw.h: organize dw_icon_set_names in a hash * file-editor.cc (notice_settings): fix path to tab close icon on mac * find-dialog.cc (find_dialog): do not set window icon here, it is already set by the editor * main-window.cc (notice_settings): set dok widget icons using the new hash structure of available icon sets (construct): use global const settings instead of literal string for main window icon * octave-qobject.cc (release_notes_widget): pass base qobject to the release note constructor * release-notes.cc (release_notes): get qbase object as argument, get desired window icon from settings * release-notes.h: constructor with base object as argument * variable-editor.cc (toplevel_change): use icon path from const preferences instead of literal strings * welcome-wizard.cc (make_octave_logo): use icon path from const preferences instead of literal strings