- Reformat logo license as a plain text file.
- Fix outdated links or references to SFC or Visual Script.
- Tweak contents of `CONTRIBUTING.md` to highlight contributor docs more
prominently, and make it easier to parse.
- Tweak formatting and contents in `thirdparty/README.md` for consistency.
text=auto works well in Git 2.10+ but it's broken in previous versions,
which are still used in production on e.g. Ubuntu 16.04 LTS.
Also fix a couple missed text files with CRLF terminators.
.bat files likely require it to be processed properly on Windows,
but core.autocrlf should take care of converting them on the fly
when checking out on Windows.
