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WIP commit, stashing these debugging changes so I can go mobile.

Finished up the changes to make argv a std::vector instead of a regular array. I also implemented the changes to control the size of argv based on system configuration and potentially spawn packJPG multiple times in order to handle a very large number of files. I ran a test on my Photos library and it sort of worked but I ran into some issues that I still need to diagnose.

Adding an optimized version of the packJPG source to the source tree for this utility since it is entirely dependent on packJPG. I started to modify the Makefile but really I shoud just use CMake. I'll work on that next.