Alternative version of navigation after binary riddle

Currently, one does not necessary need to solve the binary riddle but can simply quickly click on all D floors on the piloty map to find the place to go to.

We therefore discussed ways to mitigate this and found having a prompt asking the player to type the name/number of the room instead of presenting the piloty map to be one possible way to do so. I've now implemented this for testing, yet we can of course still decide whether we want to keep the current version, go with this one or try another possibility.

The code change replaces the piloty map with a promt asking the user to enter the room to go to as a string. It is case insensitive and allows "Fachschaft" and "Fachschaft Informatik" in addition to "D120".