Optimize output

[JohnathonNow]

Right now the output instructions are very naive, with no optimizations at all. For fun it might be worth trying out some optimization techniques. For instance, doing a push and a subtract-pop immediately results in the register being set to 0.

It seems easy enough to replace instructions of the form

PUSH_X
SUBTRACT_X

where X is either LEFT or RIGHT, with something like

RESET_REGISTER

where RESET_REGISTER sets the register value to 0.

I am sure other optimizations could be made as well.