Revert "Remove GTA_TRAIN, GTA_BRIDGE, GTA_ZONECULL"

This reverts commit 1eb817de77.

# Conflicts:
#	src/core/Game.cpp

src/core/Camera.cpp

@@ -633,7 +633,11 @@ CCamera::CamControl(void)
 					m_bInitialNodeFound = false;
 					m_bInitialNoNodeStaticsSet = false;
 				}
+#ifdef GTA_TRAIN
 				Process_Train_Camera_Control();
+#else
+				assert(0 && "this can't happen");
+#endif
 			}else{
 				if(((CVehicle*)pTargetEntity)->IsBoat())
 					boatTarget = true;
@@ -2709,6 +2713,7 @@ CCamera::DontProcessObbeCinemaCamera(void)
 	bDidWeProcessAnyCinemaCam = false;
 }
 
+#ifdef GTA_TRAIN
 void
 CCamera::LoadTrainCamNodes(char const *name)
 {
@@ -2886,6 +2891,7 @@ CCamera::Process_Train_Camera_Control(void)
 		}
 	}
 }
+#endif
 
 
 void