Deprecate passing null to non-nullable arg of internal function

This deprecates passing null to non-nullable scale arguments of
internal functions, with the eventual goal of making the b

Deprecate passing null to non-nullable arg of internal function

This deprecates passing null to non-nullable scale arguments of
internal functions, with the eventual goal of making the behavior
consistent with userland functions, where null is never accepted
for non-nullable arguments.

This change is expected to cause quite a lot of fallout. In most
cases, calling code should be adjusted to avoid passing null. In
some cases, PHP should be adjusted to make some function arguments
nullable. I have already fixed a number of functions before landing
this, but feel free to file a bug if you encounter a function that
doesn't accept null, but probably should. (The rule of thumb for
this to be applicable is that the function must have special behavior
for 0 or "", which is distinct from the natural behavior of the
parameter.)

RFC: https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg

Closes GH-6475.

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Remove unnecessary PHPDoc-alike blocks from tests

Closes GH-5759

Change argument error message format

Closes GH-5211

Make type error messages more consistent

Closes GH-5092

Reindent phpt files

Merge branch 'PHP-7.4'

Deprecate passing invalid character to base_convert etc

RFC: https://wiki.php.net/rfc/base_convert_improvements

Expect string argument in hexdec, octdec, bindec

Instead of accepting zval and converting to string. Also rewrite the
functions to make it obvious that they cannot return false.

Trim trailing whitespace in *.phpt

Trim trailing whitespace in tests

New math tests. Tested on Windows, Linux and Linux 64 bit