Implemented auto backups of project data

[abvadabra]

This PR implements simple data recovering options in case of editor crashes, power outages, etc. Implemented functionality is very similiar to data recovering options in Blender and will be familiar to it's users.

I've added Recover menu which providers two options:

• Recover Last Session.
  Open efk_quit.efkbac file which is saved in Temp directory when editor is closed under normal operation. This option allows to recover project which was lost when you accidentally closed editor and didn't save changes. If such file is not found an error will be shown.
• Recover Auto Save
  Allows user to open Auto Saved files from Temp directory. Auto Saved files will start with efk_autosave and will have efkbac extension. These files are saved automatically with interval configured in options menu (2 minutes by default). If that interval parameter is set to 0 then auto saves will be disabled.

Files with efkbac extensions are simply efkefc files with one additional property BackupOriginalPath written in their editor data. This property is used to correcty recover project's path when backup is loaded.

I've added strings translation in spanish and japanese files, but once again, as I don't speak these languages you may want to rewrite these.

[durswd]

It's cool! Thank you

[abvadabra]

Glad you liked the idea!