Stasm

This adds STASM 4.0.0 to the 3rd party folder, which compiles into a library and links with openbr if BR_WITH_STASM4 is ON.

For those that aren't familiar, STASM provides facial landmarks quickly.  Right now, we can't train our own ASMs but hopefully that will be available in the future.

Also, there a bunch of compile warnings right now that I will fix but I think people will still find this useful.