CHG: Updates to the in-game pointer mechanics, updates its position after using a tool, and hides when the pointer is outside the world.

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6493 8aca7d54-2c30-db11-9de9-000461428c89
Updated history.txt

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6494 8aca7d54-2c30-db11-9de9-000461428c89
FIX: mark world dirty on any raise, for performance reasons.

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6495 8aca7d54-2c30-db11-9de9-000461428c89