further steps towards saved games support, but still wip

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15948 3db68df2-c116-0410-a063-a993310a9797
complete the support of saved games by Petra. It is playable now, but still needs cleaning and bug fixes.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@15950 3db68df2-c116-0410-a063-a993310a9797
Merge 'remotes/trunk'