Update the Math package

[Gambet]

There are a lot of math functions that are not under the Math package when using: /scripthelp Math.* on RC. It would be much better if everything pertaining to math was under the Math package to make it easier to keep tabs on which functions exist and which don't.

And while we're on the issue of functions not working, the floor() function does not seem to be working. It's not a big deal, but for something so simple to fix, I think that it should be fixed. Also, when fixing the floor() function, you should add a ceil() function similar to the one I released here.