Change C++ .h files into .hpp files for modernisation

[JustCallMeRay]

The generally accepted assumptions are:

• .h is the file extension for C header files
• .hpp is the file extenstion for C++ header files

Currently all the C++ headers are marked as C header files. This makes it a little more confusing for tooling and people to understand how the code is intended to be used.

The LLVM style guide does use .h files (though doesn't say to use them) but they have comment with -*- C++ -*- at the top of every .h file for tooling, since we don't have said comments, I recommend moving to .hpp files instead.

More information is provided by Jason Turner

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[JustCallMeRay]

I have sent an email as the CLA bot has requested but not yet received a reply. Though I have not seen it I expect it will be signed shortly.