fixed regression: Auto TTL should set-up dedicated turning lanes properly

[kianzarrin]

fixes #1241
updates #1106

Changes:

• TTL sets-up dedicated turning lanes properly again (see Regression: Auto TTL sets-up dedicated turning lanes improperly #1241):
  • Dedicated near turn when road has 2 lanes
  • prefer far turn (because its harder).

Bonus changes:

• if cars are banned on bus lanes they are treated separately when allocating dedicated turning lanes (except single lane roads which are out of scope of this PR):
  • using TTL
  • using dedicated turning lane policy (partially fixes "cars banned from bus lanes" policy inconsistent with default lane arrows #1106).
  • using lane arrow tool.
    • Note: the cycle options on bus lanes has changed.
    • it used to cycle between mixed/separate bus lane
    • now on 2 lane roads: it cycles between dedicated near/far-turn.
    • and on 3+ lane roads: it cycles between prefer forward/far-turn
• if someone turns on the "ban cars on bus lanes" policy while "dedicated turning lanes" policy is on, then lane arrows are updated.

Scope:
This PR is meant to be a tiny fix and more complicated stuff are outside of the scope:

• if cars are banned on bus lanes and dedicated turning lanes policy is turned OFF, cars still cannot turn right (covered in "cars banned from bus lanes" policy inconsistent with default lane arrows #1106)
• if there is only 1 car lane, it is not touched (as before - see "cars banned from bus lanes" policy inconsistent with default lane arrows #1106 (comment)).

---

Test City: see #1241 (comment)
TMPE.zip

[kianzarrin]

Test:

dedicated turning lane policy when cars are banned on bus lanes:

TTL when cars are banned on bus lanes:

[originalfoo]

if someone bans cars on bus lanes while dedicated turning lanes policy is on, lane arrows are not updated (should I handle this in this PR or should I keep the changes small?)

separate PR imo

[originalfoo]

Code looks good, tested in game for 10 mins and didn't see any issues relating to PR.

[kianzarrin]

if someone bans cars on bus lanes while dedicated turning lanes policy is on, lane arrows are not updated (should I handle this in this PR or should I keep the changes small?)

separate PR imo

Now that I look at it, this takes only a couple of lines so I just added the code.

[originalfoo]

if someone bans cars on bus lanes while dedicated turning lanes policy is on, lane arrows are not updated

Tested after the additional code tweak; everything seems working in-game. 👍

[chameleon-tbn]

Tested today, Played ~2 hours w/o issues. So... I give it a Go :)

[krzychu124]

👍