Fix ParserInterface implementations

[equinoxmatt]

All the parsers (except ini) were not compliant with the ParserInterface. Most of them returned array|null, rather than array defined in the interface. Rather than fixing the parsers, (array) casts were being used in the consuming code (Config).

This PR:

• Makes all parsers compliant with the ParserInterface.
• Returns empty array in cases where null is returned from the parser parse() function.
• Removes (array) casting.
• General cleanup (remove unused params, docblocks etc).

[filips123]

It would probably be better to use array casting instead of ternary operators in all parsers. It would be cleaner and only one line instead of two.

So code will be:

return (array) $this->parse($data, $filename);

[equinoxmatt]

It would probably be better to use array casting instead of ternary operators in all parsers. It would be cleaner and only one line instead of two.

So code will be:

return (array) $this->parse($data, $filename);

@filips123 I have addressed your comments now 👍

[filips123]

Thanks!