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).
This uses a previously unused S6 flag to save this option persistently.
This should not make S6 import much harder, but should reduce the amount of questions about S4 import.
Also refactor the checks whether the user can ask money for rides or entry. This should make it a lot easier
when our own save format comes around.
