This brings feature parity with Rollercoaster Tycoon Classic (RCTC)
Includes:
* Re-enabled buttons: Ride List, Map, Scenery, Path, Clear Scenery
* Add all standard footpaths and core scenery objects to the object selection
The max limit of 4 rides has not changed; other object types can have more than 4
Only a minimum set of scenery is enabled, as the full set cannot be included
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).
