Main

Remaking a few changes that seem to have been missed in the merge (?).

Updated packJPG to latest merged version. Also updated PCA CMake to build packJPG as an external project.

Adding the all important "-march=native" compile flag to the packJPG CMakeLists.txt.

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.