Allow attributes to be applied to property/constant groups

Remove arbitrary restriction that attributes cannot be applied
to property/constant groups.

The attribute applies to a

Allow attributes to be applied to property/constant groups

Remove arbitrary restriction that attributes cannot be applied
to property/constant groups.

The attribute applies to all elements of the group, just like
modifiers and types do.

See also https://externals.io/message/111914.

Closes GH-6186.

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Run tidy

This should fix most of the remaining issues with tabs and spaces
being mixed in tests.

Change Attribute Syntax from @@ to #[]

Implement Shorter Attribute Syntax

RFC: https://wiki.php.net/rfc/shorter_attribute_syntax

Closes GH-5796.

Co-authored-by: Martin Schröder <m.schroeder2007@gmail.com>

Add Attributes

Co-authored-by: Martin Schröder <m.schroeder2007@gmail.com>