clamp() for ucube and icube has wrong argument types

@jason-rumengan clamp() for ucube and icube should have int for arg1 and arg2, as per umat and imat.
(internally the args should be arma::uword and arma::sword).

>>> from pyarma import *
>>> pyarma_version.as_string()
'0.500.0 (Everyday)'
>>> help(clamp)
Help on built-in function clamp in module pyarma.pyarma:

clamp(...) method of builtins.PyCapsule instance
    clamp(*args, **kwargs)
    Overloaded function.
    
    1. clamp(arg0: pyarma.pyarma.mat, arg1: float, arg2: float) -> pyarma.pyarma.mat
    
    2. clamp(arg0: pyarma.pyarma.fmat, arg1: float, arg2: float) -> pyarma.pyarma.fmat
    
    3. clamp(arg0: pyarma.pyarma.umat, arg1: int, arg2: int) -> pyarma.pyarma.umat
    
    4. clamp(arg0: pyarma.pyarma.imat, arg1: int, arg2: int) -> pyarma.pyarma.imat
    
    5. clamp(arg0: pyarma.pyarma.cube, arg1: float, arg2: float) -> pyarma.pyarma.cube
    
    6. clamp(arg0: pyarma.pyarma.ucube, arg1: float, arg2: float) -> pyarma.pyarma.ucube
    
    7. clamp(arg0: pyarma.pyarma.fcube, arg1: float, arg2: float) -> pyarma.pyarma.fcube
    
    8. clamp(arg0: pyarma.pyarma.icube, arg1: float, arg2: float) -> pyarma.pyarma.icube