tests: check coding style

[cdragan]

Write a Kos script which checks coding style.

Update source code to correct any coding style errors.

[cdragan]

One idea is to use clang-format to automatically format source code.

I tried clang-format-4.0, but it seems to be sub-par. In many cases it is inconsistent, for example it can format variable names to be aligned vertically for consecutive variable definitions, but it does so unreliably, some variable names are incorrectly indented for no reason. It also has problems with correctly placing '' in pointer variables, sometimes it places '' correctly, sometimes not.