Add a native or a forward for more control

[justgo97]

can we have a native that we can choose which players can have semiclip with who like : set_user_semiclip(id1, id2) or a forward : public semiclip(id1, id2) { // Your code here }

[justgo97]

Not really needed after https://github.com/dreamstalker/rehlds/pull/951