initial parser support for attributes #333
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RFC: https://wiki.php.net/rfc/attributes_v2
This PR adds parser support for attributes. At the moment, each attribute is parsed as an empty statement.
Based on the fact that in PHP work with attributes occurs through Reflection, and in KPHP there
is no Reflection, there is little point in parsing and storing attributes anywhere, so we just parse
them, checking the syntax for correctness and skip.