Assigning a pointer to std::string appears to only perform a copy and
does not transfer ownership of the pointer, thus the allocated memory is
will never be freed.
Implement a method to construct an std::string from a StringBuilder to
avoid memory leaks when retreiving the contents of a StringBuilder and
storing it in a std::string.
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).
