trains switch lanes too much

[kianzarrin]

Part of this : #1223

If the asset designer disables CanCrossLanes then the tracks should go to their respective lanes.
[EDIT] Trains switch change too much by default both at intersection and middle lanes. I think by default trains should not switch lanes too much like this:

and not like this (created with AN mod):

User should be able to override this behavior and change track transitions.

[kianzarrin]

@aubergine10 @krzychu124 should I start this?

[kianzarrin]

so this basically turns off "vehicles can switch lanes at junctions" by default when NetInfo.CanCrossLanes == false

[originalfoo]

Yup please do this :)

I assume two things:

1. It only affects train tracks and not metro/tram/etc
2. Users will be able to toggle it in-game using junction restrictions on the train junction node

[kianzarrin]

@aubergine10 after some discussion with REV0 on discord I decided to do this a bit differently ( I edited the issue too).

• I will ignore NetInfo.m_CanCrossLane
• by default all tracks will prefer to stay in lanes (with similar lane index) at intersections.
• user can overrride this behavior:
  - by using lane connections at any node
  - by enabling the "CanSwitchLane" only at junction nodes. I am not sure this is useful to anybody though so maybe just the first option.