Editor: upgrade quest data files automatically
Created by: christopho
When loading a project, if ObsoleteQuestException is catched, ask the user if he wants his quest data files to be automatically upgraded. The automatic upgrade should be done using the Lua scripts in tools/data_files_conversion, showing their output to the user. An automatic backup should be performed first.
This improvement requires to include the Lua conversion scripts to the jar archive of the editor.