Committing some changes that were originally for #7637.
- Refactor map_check_free_elements_and_reorganise
- Refactor map_strip_ghost_flag_from_elements
- Remove sub_68B089
I have removed sub_68B089 because this function was run every game tick
and 1000 times when trying to request some spare elements. It was a
lighter function which tried to stretch out the tile element pointers
behind any spare elements. In this day and age, doing a full tile
element defrag is very fast (even in debug mode it takes no more than
10ms), so I don't think keeping sub_68B089 is necessary.
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).
jensj12