Fix sensor spike handling and improve PID output stabilization

[rkimbers]

Changes Made

• Introduced a tolerance adjustment for handling sensor spikes to prevent frequent resets to automatic mode.
• Added constraints to the PID controller to ensure output remains within the specified limits.
• A few logging changes for the PID parameters and outputs.

Issue Addressed

• Hardcoded threshold for inconsistent sensor values was causing frequent spikes in fan speed (these would wake me up in the middle of the night) when sensor data briefly fluctuated.

This change SHOULD not affect other functionalities but significantly reduces noise and enhances fan control stability. I ran this script on my T640 and it was fine under load.