Convert inline to symbolic

Convert an inline function into symbolic so you can use symbolic operators like diff() or jacobian()

This program converts an inline expression into a symbolic expression, so you can use it on many Matlab operators that inline expression dosen't
work.

Usage:
Inputs:
fi=an inline function made with different names for each variable

Output:
f0=the same function fi, but converted into a symbolic function

Example:
Create an inline object that can't be simbolic differenciated
fi=inline('x^2+3*y-z^4','x','y','z')
f0=inline2sym(fi)
Now the expresion can be differenciated
syms x;diff(f0,x)