ObjUpdate Funcs of HSD Incorrectly Use enum_t instead of unsigned int

[PsiLupan]

As discussed on Discord, the ObjUpdate functions of various HSD types were changed to have enum_t for the type argument, when it is in fact an unsigned int that uses a list of #define rather than an enum. An example of this is MObjUpdateFunc.

This branch addresses some of that in commits as well as incorrect prototype declarations that were part of CObj, if someone wants to cherry-pick them. master...PsiLupan:melee:cobj-match

[ribbanya]

Do you know of a particular function that fails with signed?

[PsiLupan]

At this point, I haven't seen any. But that's more likely because calls to these are through function pointers being passed up a chain, so the compiler happened to optimize them differently.