Upkr

Upkr is a simple general purpose lz packer designed to be used in the MicroW8 platform. The compressed format is base on Shrinkler with the main difference being that Upkr doesn't differnetiate between literals at odd or even addresses.

At this point, Upkr should be considered unstable - the exact format isn't finalized yet and still subject to change and only a very simple (but also very fast) greedy compressor is implemented. The compression ratio will be improved with a more thourough lz parse in the future, although even in the current state is is already similar to the DEFLATE compression algorithm.