Refactor: Use local variables for editsections in Parser

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