added timing code
memory cleanup
allocate code block memory in one go, for each tile
document
for t1 encoder, use tile data rather than creating a new buffer for each code block and copying into

that buffer
do dc shift in mct for standard lossy and lossless transform
moved max calculation to avoid re-iterating through data
t1 cleanup
fix encode code block allocation
no need to calloc the component data, since it will be over-written with actual data
make code block encoding parallizable by creating one t1 struct

per block.
use aligned malloc for t1 compressed data
for single tile encoding, simply re-use image components, rather than

allocating two copies of each component and copying into the tile component
allow superficial re-use of codec object
cache tile compressed data and number of code blocsk in codec struct

on subsequent encodes
added fast encode path for default code block style
added basic OCL support classes