In order to remove boost:filesystem from CResourceManager Move()
function has to be removed or rewrited. Since Move is only used in
autosave rotation it's simpler to change autosave rotation and remove
Move().
Now oldest autosaves (with lowest timestamp) will be removed in rotation.
Some CScreen classes have functions which call ChangePhase() on
CRobotMain, which in turn calls ChangePhase() on CMainDialog, which in
turn deletes current CScreen object :(.
So the fix is to keep all CScreen objects created all the time and only
keep pointer to the currently active object.
This also makes it easy to clean up dependencies between CScreen classes
and get rid of all these ugly static variables and functions.
Krzysztof Dermont