Converted "tabs" to "spaces", changed the order based on the numbering of bugs, made that lines end closer to the 80th character column, changed "Mac OS X" to "macOS", and several other less important changes.
Changed HTTP links to HTTPS, fixed some links to articles on OpenTTD Wiki, added Windows 10 and 8.1 to info section about path structure in these OSes, removed some
unnecessary whitespaces (and added several others), and some other less important changes.
