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