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Help: Be clearer about which header files are considered for AUTOMOC

The old documentation stated that "all header files" were considered,
which was not true for any sensible definition of "all header files".
Only header files with certain names are considered.

Document the filename patterns matched for parsing.
Merge topic 'AUTOMOC-docs' into next

635e96dd Help: Be clearer about which header files are considered for AUTOMOC
5414b0e9 CMake Nightly Date Stamp