Bugfix floating vehicles when Parking AI disabled

[krzychu124]

• fixed floating vehicles if ParkingAI disabled
• if parkingAI is disabled, mod use vanilla code but preserve parking restrictions

Latest build of this PR is available here

Closes #846

[chameleon-tbn]

Code looks good. Works also well ingame.

Vehicles not floating and parking restrictions are recognized.

[krzychu124]

@kianzarrin wanna test it or I can merge it? I spent numerous hours to find the cause, Biffa is using this version for about 2 weeks(branded as Preview) 😅

[kianzarrin]

@krzychu124
I don't understand the [EDIT] cause of the problem or the code. there is a long list of comments in the issue. can you please explain in summary why the cars were floating?

and what does your code do? it seems to do more than just calling vanilla parking. is this a hackish fix? does this mean TMPE realistic parking algorithm is bypassed? do the buildings get red if there is not enough parking nearby? what should I expect in the test result?

[krzychu124]

Quick summary where was the bug.

When ParkingAI was disabled and Cim was about to park his vehicle, he was still using custom ParkingAI logic to search for parking spot which usually involve additional PF calls (few times wider range of search).
Disabled ParkingAI also meant that all code responsible for triggering additional path finds was inactive.
Additionally vehicle which gets Parking flag(parking spot found and vehicle is at the last position of his path to destination) has ability to drift in straight line to parking spot (commercial/residetial building parking spot) - regular vanilla behaviour.

So it is just vanilla parking search with TM:PE Parking restrictions support.

Building colors are based on statistics from TM:PE ParkingAI (found/not found) - won't work when ParkingAI is off, obviously.

[kianzarrin]

LGTM. restrictions work. cars don't float.