+ Improve GoTo activity behaviour, jumping to target.
+ Fixed crash on non-existing audio file
+ Added correct conditional flag to conditional opcodes
+ Fixed seat state on exit from non 0th seat
+ Implement many opcodes
+ Fix thread-relative jumps
+ GameObject::setHeading(degrees) sets object rotation from a heading.
+ Add More GameState from opcodes.
+ Decouple game hours from the engine clock
+ Add VehicleObject::setRotation()
+ Add GameWorld::getGroundAtPosition(pos) for OpCodes
+ Fix Handling of fixed-point SCM parameters
+ Update IngameState to use GameState::player if it exists
+ Add skip-time button to skip opening cutscene (F12)
