* Feature #11817: Show authors field in object selection
- authors field in JSON shows as last line in bottom right on object selection
- authors field added to Object class
- ObjectFileIndex version bump as authors is serialised
* fix sign comparison warning
* Start object selection corner text higher to avoid overlap
* Use references to reduce unneccessary copies
* make GetAuthors const
* Clip drawing of authors string so it doesn't cross widgets
At max length the leftmost aligns exactly with description left
* Add a changelog message
* make SetAuthors use an rvalue reference
* remove unnecessary nullptr check
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.
* GCC suddenly decided `Object` should be marked as `final`, however it is
used as a base class for more specific types that inherit from it.
* Also ignore -Wsuggest-final-methods for Object class
* Guard Object::GetName from being final
