Add math.getAverage()

[The808Error]

Basically just takes any number of arguments and returns the number average of them.

[thegrb93]

I don't think varargs is a good input for this. Should be table instead. also would rename to math.mean

[The808Error]

I did varargs to keep it consistent with math.max and math.min. If people want to use tables, then they can just use unpack().

[thegrb93]

I did varargs to keep it consistent with math.max and math.min. If people want to use tables, then they can just use unpack().

unpack so that the function has to pack it back into table. I don't like it. Min and Max weren't designed to be used on data sets, so I think the consistency isn't needed.

[The808Error]

fair