Add possibility to run selected text of the editor in the terminal * octave-qscintilla.cc(contextMenuEvent): new context menu for running selection (context_run): function for run selection action in editor file menu; (contextmenu_run): new slot for context menu run selection; * octave-qscintilla.h: new functions context_run, contextmenu_run * file-editor-tab.cc(context_run): new slot for run menu action * file-editor-tab.h: new slot context_run * file-editor.cc(request_context_run): new slot for run menu entry; (construct): new entry in run menu for running the selection in editor (add_file_editor_tab): connect new signal fetab_context_run to the new slot context_run in file_editor_tab; (set_shortcuts): enable/disable new shortcut when editor focus changes (check_actions): enable/disable new action depending on existing tabs * file-editor.h: new signal fetab_context_run, new slot request_context_edit, new run action

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