Whitespace changes by clang-format.

These files are the ones with the least number of changes when running
clang-format over them and only the less controversial changes are
included, with a preference for having stay the same where things are
likely to be more controversial.
There are options for controlling these and I purposefully reverted changes in either direction due to jumping down the rabbit hole and having a completely bike-shed discussion. I want to improve the formatting in less controversial ways first, rather than state my opinions first. And once things are in a nicer form, it will be easier to determine which approach is more common currently in the code and use that as data for deciding.

My personal preferences happen to be:

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