Update V2

Hello gang, I had a request for more features around variables from a friend, so here we are:

• OPP (Variable:opperation:float), to modify existing variables using basic opperations of addition (ADD), subtraction (SUB), multiplication (MUL), and division (DIV).
• Allowing printing of $variables$ in dialogue when surrounded by $ symbols.

The new demo text should explain everything. I also mispelt variable as varibable but I liked it enough that it stays. I've also upped a new version of V1 so that it, for some reason, no longer has a zip of itself inside it adding 12MB to the dl size.

Happy tomeing.