Forgot to rename the file
Enum-ify frame disposal method
Take out a couple things that don't need to be named vars
The main thing that's refactored here is removing "usedEntry"
- the color table contains only the actually used colors (and padding)
- this required exposing more of the quantizer's data structure opinions to the calling code, but I'll tackle that later
The color table byte count is often greater than 256