1   Add 'New in environment...' which will open "New panel" where user will
    be able to select scripting environment.
2   Add environment browser (named objects, loaded frameworks and bundles)
2.1 Implement 'Load bundle'
2.2 Implement 'Load framework'
2.3 Implement deletion of objects
3   Add menu item 'Script->Inspect selection' and add object inspector,
    like the one in Smalltalk
3.1 Object inspector (use class description)
3.2 Array inspector (delete functions for mutable arrays)
3.3 Dictionary inspector
3.4 Ability to save objects (use NSArchiver)
4   Implement document saving (warn the user, that all created objects will
    be lost)
