re-organize include dir: app/ subdir?

From bruen...@google.com on August 22, 2014 17:31:46

With the addition of the annotation headers (3 for app, 1 for client) we may want to add some heirarchy to the include/ dir. One suggestion is to have the 3 app annotation headers (currently in include/annotations/) and dr_app.h together in include/app/.

We may also want to rename dr_annotation.h vs dr_annotations.h?

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=1524