FIX: saving of scenario persistent data with non-string table keys

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6341 8aca7d54-2c30-db11-9de9-000461428c89
CODE: depot-frame imagelists store pointers, save some code stunts

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6342 8aca7d54-2c30-db11-9de9-000461428c89
FIX typo

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6343 8aca7d54-2c30-db11-9de9-000461428c89