TETRAEDGE: Restore content cut from tetraedge Syberia 1

[mduggan]

In Syberia 1 there are a number of large horizontally-scrolling scenes that were cut from the tetraedge version. However, it seems the data is still there, eg the scenes:

 BarRiverSide/24020
 ValField/11170
 ValStreet/11100

They were probably cut as horizontal-scrolling was not added in Syberia 1 tetraedge, but Syberia 2 supported it so scummvm is able to handle them. We should be able to runtime-patch the exits on the surrounding scenes to add them back in with a bit of work. This would nice to add as a game option.