Clang-format sees the text behind `#pragma region` as code and formats it. Instead of stating the copyright and date there, it's now in the comment block right below it. The text "Copyright" is left in the `#pragma region` line, as clang-format sees it as a single identifier.
I took the opportunity to normalize the dates, and add the copyright notice to the source files where it was missing them (except for third-party and the generated resources.h file).
Simplified data serialisation of game actions.
Moved the flags away from parameters.
GameAction base now serialises mandatory data such as flags and player.
Split some functions from network in order to move command processing to the end of tick.
