School random motive decay

update: added a trait version with an extra feature from Living-to-work mod. See conflict below.

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This mod applies to children and teens when they attend school. The purpose is to make every day at school somewhat different.

Here's what it does:
- 1/2 chance to randomize the rate of comfort motive decay, otherwise the game's default value will apply; if the student is lazy the possible threshold will be greater, meaning they may get a bigger drop from this motive.
- 1/2 chance to randomize the rate of hygiene motive decay, otherwise the game's default value will apply; if the student is sloppythe possible threshold will be greater, meaning they may get a bigger drop from this motive.
- 1/2 chance to randomize the rate of social motive decay; threshold range will be the same for everybody.
- Fun motive decay rate will be randomized always; students with good grades will have chance to even enjoy school (a tiny fun boost) and those with bad grades will tend to find it a bit stressful more often, however no one will be exempt from having a bad school day (a.k.a. game's default fun motive decay rate).
- I didn't touch the base values so private school on average will give lower motive drops overall.

# Trait version: Same features + students that possess the workaholic trait will never get a drop from the fun motive despite their school grade.


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Conflict found:
- School Doesn't Tank Fun mod by Nysha
- Living to work mod by PlumbBob (not needed if you choose the trait version)