Vectors: Sterility modifier as probability

[Bridenbecker]

Prashanth would like this feature and a Blood Meal Mortality fix by March 1st, 2025.

• make sure the sterility modifier is between 0 and 1
• In Update_Egg_Hatching(), when about to create the new cohort of larva, we use the sterility modifier and a binomial approximation to determine which larva are sterile and which are not. We create one cohort that is non-sterile and one that is sterile.
• In Update_Egg_Laying(), we remove our current check for sterility
• In AddAdultsAndMate(), where we create the mated female cohort, we set the cohort to be sterile if either male or female is sterile. (though you might want to know how many non-sterile females mated with sterile males) - this lets us use the same sterile flag.
• In AddEggsToLayingQueue(), we add "is not sterile" to the "if has mated" check - i.e. don't lay eggs if cohort is sterile.