Main

Finished up packjpg_simple utility to demonstrate that the library
works correctly.

Started making a simple test program.

WIP for libpackjpg reorganization: finished moving functions into the
wrapper class

WIP for libpackjpg reorganization: moved all jpeg specific functions into the wrapper class

WIP for libpackjpg reorganization: stashing current progress so I can go
watch TV while working

WIP for libpackjpg reorganization: moved all main interface and main
functions inside the wrapper class

WIP for libpackjpg reorganization: moved all global variables to be
instance variables and converted a couple of trivial functions.

WIP for libpackjpg reorganization.

Reformat modified source files.

Adding unifdef'ed files and CMake config to build.