In addition, several variables which contained instances of ParserOutput
were renamed to $parserOutput to help future humans and code-searchers
to distinguish these from instances of OutputPage.
Bug: T296123
Change-Id: Ic532bca4348b17882716fcb2ca8656a04766c095
Clear up a bunch of phpcs ignores by documenting many methods.
Also remove Scribunto_LuaError::setLineMap(), which has apparently never
been used since it was added in Ia51f439e.
Change-Id: I763bcdbc7edbbb8e4600495a03acca3439fc0ec9