php_mb_convert_encoding{,_ex} returns zend_string

That's what all existing callers want anyways. This avoids 2
unnecessary copies of the converted string.

Use fast text conversion filters to implement php_mb_convert_encoding_ex

Add fuzzer for mb_convert_encoding

This uses the php-fuzz-mbstring name, moving the existing fuzzer
to php-fuzz-mbregex.

Add fuzzer for function JIT

This is a basic fuzzer for the function JIT, which looks for
crashes and sanitizer violations only, and does not try to detect
differing behavior yet.

Update http->https in license (#6945)

1. Update: http://www.php.net/license/3_01.txt to https, as there is anyway server header "Location:" to https.
2. Update few license 3.0 to 3.01 as

Update http->https in license (#6945)

1. Update: http://www.php.net/license/3_01.txt to https, as there is anyway server header "Location:" to https.
2. Update few license 3.0 to 3.01 as 3.0 states "php 5.1.1, 4.1.1, and earlier".
3. In some license comments is "at through the world-wide-web" while most is without "at", so deleted.
4. fixed indentation in some files before |

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Fix mbstring fuzzer

mb_ereg can throw now, so we need a dummy frame and need to
free the exception afterwards.

Further reduce parse depth limit in mbstring fuzzer

Depth limit of 1024 still causes optimize_node stack overflows
when running under asan.

Limit parse depth in mbstring fuzzer

The default depth of 4096 is large enough to cause optimize_node
stack overflows under asan. Reduce to 1024.

Remove mention of PHP major version in Copyright headers

Closes GH-4732.

Various improvements to fuzzer SAPIs

Add fuzzer SAPIs to the core