Refactor: Use local variables for editsections in Parser

In Parser.php an array was built and then the elements of that array
were used, replaced this by local vars.

In ParserOutput.php also use local vars to make the code more readable.
Also inlined a private callback by using an anonymous function.

Change-Id: I1c31c9e4855f93a8fb65e1c21faba46fcdcb1f4b
Merge "Refactor: Use local variables for editsections in Parser"