Miscellaneous suggestions/New AI for Trains

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Feature Suggestions
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Suggestions about RR AI. Those are only suggestions and might need reworking and also a lot of coding if someone gets to do some of those.

ver. 1 by Ar4i

1. The most important thing is to find a better way of creating those routes between two stations. Currently AI constructs poor quality routes particularly if the way is obstructed.
2. With “no 90 degree turns” option existing the AI should avoid making 90 degree turns.
3. The way AI builds lines should be changed, it should calculate the route first then reserve the land and build slowly or just build it all at once if the reserving land is too hard to implement. In the second case, the speed of AI building new RR lines can be controlled via other means like making it wait months between every RR line built or something else.
4. From time to time (like once per year or maybe 6 months) the AI might try to improve the service by extending the stations and reconstructing one-way lines into two way where possible, to allow an easy way of placing more trains (limited of course). When bringing more goods to(or from) an industry where the same AI has some station it should try to extend it instead of building a new one. AI should also degenerate and close down non profitable lines.
5. AI should first try to use all possible non served industries before trying to serve ones the player has low rating at.