Modified the symbolication.Image object to store its uuid as a uuid.UUID...

Modified the symbolication.Image object to store its uuid as a uuid.UUID object and made an accessor for getting a normalized UUID value out of the image object.

Modified the crashlog darwin module to always create a uuid.UUID object when making the symbolication.Image objects. Also modified it to handle some more types of crash log files and improved the register reading for thread registers of crashed threads.

llvm-svn: 156596