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