Compatibility regression of `hydros` flag `r` (rudder input)

[ohlidalp]

Kudos to DannyWerewolf on Discord for finding and reporting!

The problem:

• on current stable release (2022.04) and prior, the hydros flag r (rudder input) also works for land vehicles and, quote: On current release, with "r" is exactly how it should be, and about how fast the trucks have always steered with default sensitivity on controller.
• on current git master branch, when r flag is present, the hydro doesn't respond to keyboard at all.

Next steps: I'm going to investigate what hapenned and later document this "trick" because I like when players get creative with the software and find edge cases. I'm also keen to maintain backwards compatibility.

Discuss on the forum: https://forum.rigsofrods.org/threads/hydro-r-flag.3709/

[ohlidalp]

I found the culprit: 9421c6843c10973c835e2e44de730f6f5919405d

Apparently, I was (once again) careless when maintaining the truck file format (just this time not the parser but the spawner). There was a nicely commented "quirk" snippet https://github.com/RigsOfRods/rigs-of-rods/commit/9421c6843c10973c835e2e44de730f6f5919405d#diff-f4be9d8504e97f595a60f43768208d63f3c0b62dc8565f08a65df80720ff8d37L3696-L3704 that I tried to implement more elegantly https://github.com/RigsOfRods/rigs-of-rods/commit/9421c6843c10973c835e2e44de730f6f5919405d#diff-f4be9d8504e97f595a60f43768208d63f3c0b62dc8565f08a65df80720ff8d37R3691-R3695 but I introduced a bug: it would break as soon as another flag, for example 'r', was added.