Choonster:
	- Replace %d with %.0f in format patterns
	-- ogginfo can return non-integer file lengths, which don't work with
	%d.
	- Stop using -r option to sed
	-- -r is a GNU extension, not portable to all platforms
	- Add option to use backslashes in PM_Unix.sh
	-- Move `then` and `do` to same line as `if` and `for`
	- Update TOC to 50200
	- Change PopulateMusic_Windows.js to compare file types instead of file
	extensions (which are only included in the name when they're shown in
	Windows explorer).
	-- Move file type checks into the isAudioFile function to make the logic
	easier to change in future.
	- Replace all == with === in PM_Windows.js
	- Add a missing backslash in the main comment of
	ScriptParts\music_part0.lua and music.lua
