* Fixed many -Wreserved-id-macro warnings by fixing header guard spelling
Removed leading underscore(s) from header guard spelling. Used 2 regexes:
` _H5(.*)_H`
` __H5(.*)_H`
Applied case-insensitively to only .h files.
* Modified scripts that generate header files to not use underscore prefix
Interestingly, there was already no leading underscore in the trailing comment at the end of the file
* Fixed remaining -Wreserved-id-macro warning not caught by regex
c17b4b93d6