Crash fix for map loaded the old version of the mod

Redesigned the dialogue logic for being player-friendly

Bugfix for crash on selecting non station objects

- Support to modify finished underground station
- Correction of sign name position
- Remastered icons

Support of station name sign

Fixed bug that crashes under non-debug mode of the game.

1.1 Bigfix and support of underground station

Fixed the bug that underpass are not connected...

Bugfix for dissapperad entry while modification