AcpiHelp: Add UUID support, restructure some existing files, 3 new files.

This adds a -u option to AcpiHelp to display all known ACPI UUIDs.
Some existing files in the core code have been restructured.
Three new files.
Makefiles/ProjectFiles: Update for new files.

Update for new files created in the previous commit.
Debug object: Add current value of Timer() to debug line prefix.

Simplifies timing of things like control method execution.
GPEs: Do not allow enable for GPEs that have no handler(s).

There is no point in enabling a GPE that has no handler or
GPE method. At worst, it can cause GPE floods.
Rafael Wysocki.