Update FreeImage to 3.16.0 (custom compiled)

FreeImage is an excellent library, but official releases take
foreeeeever to happen.  The latest 3.16.0 dev build includes the usual
batch of improvements (all format plugins updated, e.g. libjpeg, libpng,
etc), plus some specific ones useful to PD (faster resizing with better
edge pixel handling), many bugfixes, and new support for WebP and
JPEG-XR.

Rather than wait for an "official release", I've gone ahead and compiled
a new copy myself.  This will allow me some time to test things like
WebP and JPEG-XR support before 6.2 releases.
Update ExifTool to latest version (9.46)