JpegCompressor improvements

A0 Entropy coder uses different frequency models for components and AC/DC coefficients

JpegCompressor alpha version

Please, see the doc here

Performance improvements

Some performance optimizations

Documentation

Create documentation and code clean up

Base implementation

Implemented the following algorithms:

RLE, BWT, MTF, Arithmetic Coding

Compressor chain: RLE -> BWT -> MTF -> RLE -> A0

TODO:

use LZ* instead of RLE