Fix shivering mechanism

[peter4370]

Summary

Bugfixes "Fix shivering mechanism"

Purpose of change

Fix #47671
Fix #53443
While being cold could prevent you from sleep in real life, It is unclear if the warmth in @ window is enough to prevent shivering and leads to confusion.
Also you can fall asleep while being too cold if you are tired enough in real life.

Describe the solution

Lowering the threshold to let player could sleep in spring.
Also make player able to sleep if they are deadly tire to prevent extreme sleep deprivation.

Describe alternatives you've considered

Make body temperature more accurate. (see #58961)
Remove this mechanism as we have another being too cold wakes you up mechanism at player_hardcoded_effects.cpp

Testing

Test 1:
Create a character spawn in spring
Being naked
Set fatigue to tired
Being able to sleep without waking up
Test 2:
The same as above but in winter
Wake up due to cold after falling asleep
Test 3:
The same as test 2 but being exhausted
Ignore warnings and keep trying to sleep
Wake up from cold because the code in player_hardcoded_effects.cpp
Try sleep again and die because of too cold

Additional context

Some comments in update_bodytemp.cpp are incorrect. I updated them in this PR too.
I don't see #53411 happening so if someone checked it doesn't happen anymore that issue could be closed.

[Fris0uman]

Maybe make it so you still get a message about shivering with the same condition as before but it only wakes you up if it's really cold (and you're not dead tired)?

[peter4370]

I'm busy recently and don't want to work on this PR. If anyone want to fix the issue I would happy to see that