[PATCH v3 0/5] Exception Extensions

[Kinsey Moore]

This patch set is a rework of the previous Exception Management API
patch set based on feedback from the community. From the last revision:
* Everything has been moved out of the RTEMS Classic API namespace
* The concept of exception classes have been removed in favor of a
  direct CPU_Exception_frame to signal mapping function
* The added tests have been reworked to accomodate the above changes

It was not possible to defer the call to raise() to a post-switch action
since the post-switch action list is already locked and thus cannot be
relocked by calls underneath raise() to add the signal handler call to
the list.