Reformat all code according to clang-format

[jiridanek]

This follows up to

• Initial clang-format work: config file and git-clang-format instructions #504
• Add git precommit with clang-format #660

[jiridanek]

• CI job to check that everything is formatted; not sure if git precommit is sufficient guarantee of that or not

[jiridanek]

There is no format but clang-format and everything is to be accomplished according to the will of clang-format.

[jiridanek]

This is not going to happen. The clang format config file remains in the repository and everyone is free to use it, regarding e.g. * alignment in pointer declarations.

It is generally felt that clang format is too strict and it goes too strongly against people's wishes.

We should add

SeparateDefinitionBlocks: Leave

to the clang config, though.

[jiridanek]

Here is the issue about "LeaveAlone"

• clang-format: LeaveAlone llvm/llvm-project#54137

Interestingly, there are four option that currently take "Leave" as an value, such as that SeparateDefinitionBlocks thing.

Maybe it will happen one day and clang-format will be more like go fmt in this way.