Many include statements use forward slashes, while others use backwards
slashes. This is inconsistent formatting. For this reason, I changed the
backward slashes to forward slashes since that is the standard.
- "Windows Internal Library" got named "Windows Implementation Library" for its GH release
- Fixed the links to point to the files in the WIL GH instead of the local copies.
- Left the rest of this as general guidance to how we use it.