Compatibility Changes for PHP8 and Newer Releases of PhpUnit

[oleibman]

XMLReader - do not call libxml_disable_entity_loader for PHP8+
XMLWriter - 1. delete temporary files on Windows for PHP7.3+ (there had
been a problem with unlink on Windows before then).
2. Eliminate unneeded writeAttribute (tested against PhpWord
as well as Common without any issues). Current code was
a problem with newer PhpUnit.
DrawingTest - assertIsArray, when available, in lieu of assertInternalType
FileTest - assertIsString, when available, in lieu of assertInternalType
XMLReaderTest - expect exceptions in code, not DocBlock.
XMLWriterTest - 1. PHP8 ignores locale when converting float to string.
This is also a problem for PhpSpreadsheet.
2. Added some tests to improve coverage.

[oleibman]

Travis failures - 5.4/5.5 cannot be loaded, doesn't seem I can do anything about that; same with hvvm.

7.1/7.2/7.3 all need a simple fix for pclzip, but I don't know how to get that changed. I do know what the fix is (remove the non-numeric suffix):
if ($last == 'g') {
//$v_memory_limit = $v_memory_limit102410241024;
$v_memory_limit = substr($v_memory_limit, 0, -1) * 1073741824;
}
if ($last == 'm') {
//$v_memory_limit = $v_memory_limit1024*1024;
$v_memory_limit = substr($v_memory_limit, 0, -1) * 1048576;
}
if ($last == 'k') {
$v_memory_limit = substr($v_memory_limit, 0, -1) * 1024;
}

[liborm85]

I'm added compatibility for PHP 8.0 in PR #34, travis fixed for all PHP versions also.

[oleibman]

Wonderful! Sorry that I didn't notice your change before pushing. Closing my ticket.