Format with clang-format
Format with clang-format

The reason for doing this now is that the code was already untidy
according to uncrustify. Given this, I took the opportunity to switch to
clang-format given that is the direction we have been moving in other
repos.

maxmind/MaxMind-DB-Reader-python,maxmind/MaxMind-DB-Reader-python,maxmind/MaxMind-DB-Reader-python