Path Changes/Possible Breakages

I’m currently making a number of potentially disruptive changes to normalise include paths in the RISC OS sources. None of this is meant to be a functional change, but due to the scope and number of changes, there might be some temporary breakages, so I’d like to apologize in advance. But if you have problems, or in the likely event I do miss something, let me know, and I’ll fix ASAP.

Thanks.