vvq: image compression for CADRG in C++

Georeferenced image databases use a lot of space when stored in raw format. Compressed images require a valuable processing power when read in onboard computers in civilian and military vehicles and aircraft. CADRG standard was created to solve both problems and requires an image compressed using vectorial quantization and color palette. This is an open source implementation to compress an image with the parameters specified in the CADRG standard.