auto completion offers builtins and file functions for octave (bug #41371) * file-editor-tab.cc (update_lexer): read settings whether builtin and file functions should also be considered in auto completion for octave files; when functions are also displayed, updating of the files with prepared auto completion informations depends on last modification date of package lists; (add_octave_apis): new function for adding strings to the lexer APIs from the internal octave functions * file-editor-tab.h (add_octave_apis): new function * main-window.cc (handle_octave_ready): call function for creating the empty tab in the editor here because all octave functions must be known for creating the auto completion information * settings-dialog.ui: new checkboxes for auto completion of octaves buitlin and file functions * settings-dialog.cc (constructor): read states for new checkboxes from the settings file; (write_changed_settings): write states of new checkboxes into the settings file

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