Uh?

It's been a while since the last commit. I remove the camera and the
options system cuz they're not necessary anymore, and will be replaced
soon.
New Functions and organization

Added two functions that encapsulate functionality that was achieved by
this fucked up if/then tree. One function reformats input equations, and
the other checks to see if they're evaluable. Also, considering banging
together a little expression library of my own to use for this, since
NCalc is kinda clunky.