Multiple offsets

[eshaz]

• Encoded size might be decreased by allowing for mulitple offsets in a single encoded string. A table could be added with byte counts and offsets that describe which offsets to use for each chunk. This would be generated during encoding with the optimal configuration.
• If there are any byte values that are not used in the input, the largest chunk of escaped characters could be shifted into these byte values as long as the unused byte value does not need to be escaped itself.