These functions allows you to call any public function of any class
from a کامپوننت. This function can be native, or written in گامباس.
First, you must use GB.GetFunction to retrieve sort of a function
pointer from the name of the function and the class it is declared in.
Then, you call the function by first pushing arguments on the
interpreter stack with GB.Push, and then effectively
executing the function with GB.Call.