Rename fatigue to sleepiness

[I-am-Erk]

Summary

Infrastructure "Rename 'fatigue' to 'sleepiness', mostly on the back end, to avoid confusing different ways of being knackered"

Purpose of change

Part of #59858, see that issue for more details. Basically, we are modeling a lot of things already that are different ways of exhausting physical and mental resources: stamina, fatigue, weariness, focus... it gets very confusing, and unfortunately I really want to add one more. I think before doing that, we should try to do what we can to make it harder to confuse these things for each other.

Venera is more of an expert on airways than me and doesn't want me to name 'stamina' into 'breath' so I guess let's say:

closes #59858

Describe the solution

Renames "fatigue", which is very vague and describes anything from "my arms are tired" to "I need to sleep" to "that steel support is going to give way", into "sleepiness", which isn't my favourite term - it is a bit clunky - but should be hard to confuse for anything else.

This is the result of a large find-and-replace. i have tried to read through every change and make sure I didn't miss anything, but it definitely needs another look-over by someone else. I have made sure we didn't describe someone as wearing 'combat sleepiness', and in most descriptive text I've kept the word 'fatigue' unless I'm certain it's talking about need for sleep alone.

Also renamed fd_fatigue to fd_reality_tear, which may cause a json error or two, but I think is worth it for the clarity in code.

Describe alternatives you've considered

I considered 'drowsiness' as another option. I considered calling it just 'sleep' or 'sleepy' but they don't fit the structure we're using it in. "mod_sleepy" sounds stupid and unintuitive as a method.

Testing

The game compiles and runs without error

Additional context

I am fairly sure this is going to break something, but I haven't figured out what yet.

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[IdleSol]

Did you forget about the documentation? Or in a separate PR?

[I-am-Erk]

Ugh. Forgot about it, thanks for the reminder

[IdleSol]

data/json/ui/fatigue.json --> data/json/ui/sleepiness.json ?

[I-am-Erk]

good catch, thanks idlesol

[Standing-Storm]

Is renaming the field fd_fatigue (aka Tears in Reality) to fd_sleepiness (plus related things like mongroups etc) intended?

[I-am-Erk]

I had assumed the field was causing fatigue, but if it's supposed to be something else we should probably give it a different name entirely.