- Fixed ZTS build

MFH: Fix indirect reference of $this

Removed compile time dependency from ext/mbstring

- fix ts build

Allowed indirect $this access (Scott)

Removed support for break/continue $var syntax

Added multibyte suppport by default. Previosly php had to be compiled with --enable-zend-multibyte. Now it can be enabled or disabled throug zend.multibyte directive in php.ini

- Fixed compile warnings

Fixed bug #35547 (Segfault accessing static method)

Fixed problem reported by Patrick ALLAERT. Trait method was not applied properly when fully qualified.

Fixed covariance of return-by-ref constraints

Fixed covariance of return-by-ref constraints

Fixed bug #51008 (Zend/tests/bug45877.phpt fails)

- Improved memory usage
. zend_function.pass_rest_by_reference is replaced by
ZEND_ACC_PASS_REST_BY_REFERENCE in zend_function.fn_flags
. zend_function.return_reference is replace

- Improved memory usage
. zend_function.pass_rest_by_reference is replaced by
ZEND_ACC_PASS_REST_BY_REFERENCE in zend_function.fn_flags
. zend_function.return_reference is replaced by ZEND_ACC_RETURN_REFERENCE
in zend_function.fn_flags
. zend_arg_info.required_num_args removed. it was needed only for internal
functions. Now the first arg_info for internal function (which has special
meaning) is represented by zend_internal_function_info structure.
. zend_op_array.size, size_var, size_literal, current_brk_cont,
backpatch_count moved into CG(context), because they are used only during
compilation.
. zend_op_array.start_op is moved into EG(start_op), because it's used
only for 'interactive' execution of single top-level op-array.
. zend_op_array.done_pass_two is replaced by ZEND_ACC_DONE_PASS_TWO in
zend_op_array.fn_flags.
. op_array.vars array is trimmed (reallocated) during pass_two.
. zend_class_entry.constants_updated is replaced by
ZEND_ACC_CONSTANTS_UPDATED in zend_class_entry.ce_flags
. the size of zend_class_entry is reduced by sharing the same memory space
by different information for internal and user classes.
See zend_class_inttry.info union.

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Fixed bug #52614 (Memory leak when writing on uninitialized variable returned from method call)

- Improved fix for bug #52573

- Improved fix for bug #52573

separate properties of internal classes in ZTS mode fully,
otherwise multiple threads will modify the zvals' contents
without any synchronisation.

In ZTS mode default properties and constants of internal classes can't be modified in place and have to be separated

In ZTS mode default properties and constants of internal classes can't be modified in place and have to be separated

Use interned strings for class names

ZEND_UNSET_* don't have results

ZEND_FETCH_*_R operations simplified and can't be used with EXT_TYPE_UNUSED flag any more. Thit is very rare and useless case. ZEND_FREE might be required after them instead.

- Fix ZTS build

- use interned strings for auto globals
- $GLOBALS became a JIT autoglobal, so it's initialized only if used (this may affect opcode caches)