fixes a syntactical inconsistency with group use and leading `\`

discussion: http://news.php.net/php.internals/87774

Improved zend_string API (Francois Laupretre)

Squashed commit of the following:

commit d96eab8d79b75ac83d49d49ae4665f948d15a804
Author: Francois Laupretre <francois@tekwire.net>

Improved zend_string API (Francois Laupretre)

Squashed commit of the following:

commit d96eab8d79b75ac83d49d49ae4665f948d15a804
Author: Francois Laupretre <francois@tekwire.net>
Date: Fri Jun 26 01:23:31 2015 +0200

Use the new 'ZSTR' macros in the rest of the code.

Does not change anything to the generated code (thanks to compat macros) but cleaner.

commit b3526439104ac7a89a8e0c79dbebf33b22bd01b8
Author: Francois Laupretre <francois@tekwire.net>
Date: Thu Jun 25 13:45:06 2015 +0200

Improve zend_string API

Add missing methods

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Drop unnecessary %prec

Leftover from a previous implementation

Even fake token better to be in upper case

Fix tokenizer test due to recent changes

Also unreserve T_CLASS

Set %expect to 0 in parser (Using %prec)

Rebuild scanner, add NEWS/UPGRADING

ext tokenizer port + cleanup unused lexer states

we basically added a mechanism to store the token stream during parsing
and exposed the entire parser stack on the tokenizer extension th

ext tokenizer port + cleanup unused lexer states

we basically added a mechanism to store the token stream during parsing
and exposed the entire parser stack on the tokenizer extension through
an opt in flag: token_get_all($src, TOKEN_PARSE).

this change allows easy future language enhancements regarding context
aware parsing & scanning without further maintance on the tokenizer
extension while solves known inconsistencies "parseless" tokenizer
extension has when it handles `__halt_compiler()` presence.

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implement context sensitive language with lexical feedback

The implementation has no regression risks, has an even smaller footprint
compared to the previous attempt involving a pure lex

implement context sensitive language with lexical feedback

The implementation has no regression risks, has an even smaller footprint
compared to the previous attempt involving a pure lexical approach, is higly
predictable and higly configurable.

To turn a word semi-reserved you only need to edit the "SEMI_RESERVED" parser rule,
it's an inclusive list of all the words that should be matched as T_STRING on specific contexts.
Example:

```
method_modifiers function returns_ref indentifier '(' parameter_list ')' ...
```

instead of:

```
method_modifiers function returns_ref T_STRING '(' parameter_list ')' ...
```

TODO: port ext tokenizer

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More cleanup (mainly retab)

Rebase Joe's anon classes implementation

Fix bug #60022

Throw ParseException from lexer

Primarily to avoid getting fatal errors from token_get_all().

Implemented using a magic E_ERROR token, which the lexer emits to
force a parser fa

Throw ParseException from lexer

Primarily to avoid getting fatal errors from token_get_all().

Implemented using a magic E_ERROR token, which the lexer emits to
force a parser failure.

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Improved parser (make use_type reuseable)

fix compilation warnings, rename batch_use to group_use

require trailing T_NS_SEPARATOR #1005

allow non mixed use declarations, CC @nikic #1005

```
use function N\S { foo, bar, etc };
use const N\S { FOO, BAR, ETC };
```

Related tests:

```
make test

allow non mixed use declarations, CC @nikic #1005

```
use function N\S { foo, bar, etc };
use const N\S { FOO, BAR, ETC };
```

Related tests:

```
make test -j4 TESTS="-m Zend/tests/ns_0{88..92}*.phpt"
```

All namespace tests:

```
make test -j4 TESTS="Zend/tests/ns_*.phpt"
```

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first implementation of batch use compilation

Added yield from operator

WIP

Fix merge error

Do not make scalar type hints reserved words, merely reserve class name

Scalar type hints with ZPP casting rules

Márcio Almada remove dead tokens: T_CHARACTER, T_BAD_CHARACTER.