Update header class dumps for iOS 8.1

The last header class dump was [done against iOS 5.0](https://github.com/TestingWithFrank/PublicAutomation/blob/master/PublicAutomation/UIAutomation.h#L48), this updates them for iOS 8.1. This also makes a few minor changes:

1. Leaves all `UIAutomation` headers in their respective files
1. Moves said files to Headers/
1. Comments out a few build errors and warnings with reference to the following:
  * __va_list_tag
  * CDStruct_3eca2549
  * CDStruct_70511ce9
  * __IOHIDEvent
  * __AXObserver
1. Adds a default `@property` decorator (assign) to squash a warning

All changes were done after the initial class dump so they can be tracked and commented on individually.