Revise the interaction of the ground sensor, climbing sensor, and step sensor.

[astrochili]

1. The ground sensor should not fall under the ground when walking on the small steps that are lower than the sensor. Otherwise the walker has a legal but wrong vertical position.

Example from @ReanimatorXP:

2023-06-08.09-00-27.mov

Here the sensor goes underground when the walker enters the pipe. Then, after the jump, the sensor is restored to the correct vertical position and the walker can no longer get out of the pipe, as it's higher than it was when entering.

2. Climbing the incline and climbing the steps must be separate mechanics, they must exclude each other. Now they work together and it gives some acceptable result, but no so good:

ezgif.com-resize.mp4

Perhaps it would be better if climbing stairs just lifted the character sharply upwards, and the motion softening was achieved by the camera? Note sure yet.