new state machine based shell (new_shell branch)

modules/gui/pymod/__init__.py

modules/gui/src/CMakeLists.txt

modules/gui/src/gosty.cc

modules/gui/src/gosty_app.cc

modules/gui/src/plot_viewer/plot_data_graphics_item.cc

modules/gui/src/python_shell/output_redirector.cc

modules/gui/src/python_shell/output_redirector.hh

modules/gui/src/python_shell/python_interpreter.cc

modules/gui/src/python_shell/python_interpreter.hh

modules/gui/src/python_shell/python_interpreter_proxy.hh

modules/gui/src/python_shell/python_interpreter_worker.cc

modules/gui/src/python_shell/python_interpreter_worker.hh

modules/gui/src/python_shell/python_namespace_tree_item.cc

modules/gui/src/python_shell/python_namespace_tree_model.cc

modules/gui/src/python_shell/python_shell.cc

modules/gui/src/python_shell/python_shell.hh

modules/gui/src/python_shell/python_shell_widget.cc

modules/gui/src/python_shell/python_shell_widget.hh

modules/gui/src/python_shell/state.cc

modules/gui/src/python_shell/state.hh