Honor strict_types=1 for attributes, improve backtraces

Make ReflectionAttribute::newInstance() respect the strict_types=1
declaration at the attribute use-site. More generally, pretend

Honor strict_types=1 for attributes, improve backtraces

Make ReflectionAttribute::newInstance() respect the strict_types=1
declaration at the attribute use-site. More generally, pretend that
we are calling the attribute constructor from the place where the
attribute is used, which also means that the attribute location will
show up properly in backtraces and inside "called in" error information.

This requires us to store the attributes strict_types scope (as flags),
as well as the attribute line number. The attribute filename can be
recovered from the symbol it is used on. We might want to expose the
attribute line number via reflection as well.

See also https://externals.io/message/111915.

Closes GH-6201.

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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>

Review the usage of apostrophes in error messages

Closes GH-5590

Implement Attribute Amendments.

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

Support for attribute grouping is left out, because the short
attribute syntax RFC will likely

Implement Attribute Amendments.

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

Support for attribute grouping is left out, because the short
attribute syntax RFC will likely make it obsolete.

Closes GH-5751.

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Add Attributes

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