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).
When adding entries to scenery groups by hand, like we do for a lot of ToonTowner's stuff, it currently tries to get the loaded scenery group. If this happens not to be loaded at that time, this will fail.
Instead, hardcode the headers - that's how object .DATs do this anyway.
