Generate function entries for another batch of extensions

Closes GH-5352

Promote invalid case mode to ValueError in mb_case_converter

Add assertions to check the return value is not NULL as this indicates a bug.
Add identical assertion to mb_strtoupper and mb

Promote invalid case mode to ValueError in mb_case_converter

Add assertions to check the return value is not NULL as this indicates a bug.
Add identical assertion to mb_strtoupper and mb_strtolower.
This means these functions can't return false anymore, ammend stubs accordingly.

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mb_scrub() can't return false anymore

Also drop the intermediary function which was only used here

Refactor mb_substr_count()

Promote empty needle warning to ValueError
Convert if branch into an assertion as if mbfl_substr_count fails this now implies a bug
Thus mb_substr_count()

Refactor mb_substr_count()

Promote empty needle warning to ValueError
Convert if branch into an assertion as if mbfl_substr_count fails this now implies a bug
Thus mb_substr_count() can only return int now, fix stubs accordingly

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Convert if branch to assertion in mb_strlen

This operation should never fail, therefore it's converted to an assertion.
Thus this mb_strlen() can now only return int, fix stubs according

Convert if branch to assertion in mb_strlen

This operation should never fail, therefore it's converted to an assertion.
Thus this mb_strlen() can now only return int, fix stubs accordingly

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Promote mb_str_split warning to ValueError

Also add a TODO about documenting this funcion on PHP.net
Convert some checks to assertions as if they don't hold something went wrong during m

Promote mb_str_split warning to ValueError

Also add a TODO about documenting this funcion on PHP.net
Convert some checks to assertions as if they don't hold something went wrong during memory allocation
Due to these changes this function cannot return false anymore, fix stubs accordingly

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mb_detect_order(): Use proper array|string argument

mb_check_encoding(): Make var a proper array|string arg

mb_detect_encoding(): Use proper array|string parameter

Needed to add support for nullabiltiy in some places.

mb_convert_variables(): Make $from an array|string argument

mb_convert_encoding(): Make $input a proper array|string arg

mb_convert_encoding(): Make $from_encodings a proper array|string arg

Switching to FastZPP, as we don't support this in normal zpp.

Revert "Replace @param annotations with type declarations"

This reverts commit c31029f335ca1b453af799805c43c37e959ad555.

Replace @param annotations with type declarations

Add union return types for function stubs

Expect appropriate parameter type in the first place

`mb_encode_numericentity()` and `mb_decode_numericentity()` accepted
arbitrary zvals as `$convmap`, but ignored anything else than ar

Expect appropriate parameter type in the first place

`mb_encode_numericentity()` and `mb_decode_numericentity()` accepted
arbitrary zvals as `$convmap`, but ignored anything else than arrays.
This appears to be an unresolved relict of their ZPP conversion for
PHP 5.3[1]. We now expect an array in the first place.

We also expect `count($convmap)` to be a multiple of four (else we
throw a `ValueError`), and do no longer special case empty `$convmap`.

[1] <http://git.php.net/?p=php-src.git;a=commit;h=1c77f594294aee9d60e7309279c616c01c39ba9d>

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Add MBString arginfo stubs