PEL: ExtendedUserData section class

This class represents the Extended User Data section. This section is
similar to the UserData class in that it stores free form FFDC data,
except

PEL: ExtendedUserData section class

This class represents the Extended User Data section. This section is
similar to the UserData class in that it stores free form FFDC data,
except that it is meant to be added to an already existing PEL by a
creator subsystem that is different than the PEL creator's subsystem.
As such, it stores the section creator's creator ID value as a field
within the section, which the regular UserData class doesn't do.

The same parsers that run on the UserData section can also run on this
section.

Change-Id: I8562a89141f0305e397703f0cb92a06eb9f10133

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