duplicator.GenericDuplicatorFunction() improvements

[kirillbrest123]

duplicator.GenericDuplicatorFunction() now runs PlayerSpawnSENT and PlayerSpawnedSENT, similar to MakeProp().

This change will fix the duplicator ignoring sbox_maxsents and will allow you to dynamically control whether specific entities can be duped without having to define a factory function (or worse, redefine it). It also makes duping SENTs more consistent with duping props and other things as they do run their respective PlayerSpawn* hooks when duped.

Possible issues: can't find any. Spawning default entities and random workshop dupes seems to be working as expected (e.g. nothing is counting towards 2 limits at the same time)

Further changes: update wiki pages for PlayerSpawn* hooks to reflect that they are ran not only when things are spawned from the Q menu. You could also add a bool Duplicated argument to these hooks, or maybe even string SpawnMethod (= "spawnmenu",
"duplicator", "some_custom_method") to allow modders to add and control custom spawn methods organically.