Feature: output total line counter

[KONEY]

Most of the times, when experimenting with different gradients, the need is to end up with the same amount of instructions as the previous copperlist but setting different noise or colour parameters the size of output increases or decreases drastically. This can't obviously be changed but a counter of total lines would be very helpful when trying to match a specific copperlist size.

[grahambates]

Yeah that shouldn't be a problem. I'll give it a go.