Update the regexp to avoid catastrophic backtracking

[juzser]

Description

Reference Issue: #1800
Update from this PR: #1801

When you have multiple Blocks in multiple Rows, some of blocks cannot be replaced
Only the last block was replaced.
This because some word file will drop-line after xml tag, and the regular expression engine in different versions cannot find the matched block.

Fixes # (issue)
File: TemplateProcessor.php
Line: 740

Change the regexp pattern to:

'/(.*((?s)<w:p\b(?:(?!<w:p\b).)*?\${' . $blockname . '}<\/w:.*?p>))(.*)((?s)<w:p\b(?:(?!<w:p\b).)[^$]*?\${\/' . $blockname . '}<\/w:.*?p>)/is',

Describe:

• Do not find for xml.
• Start find the <w:p tag that closest to the blockname.
• This <w:p does not contain any other <w:p inside it.

Checklist:

All Done

• I have run composer run-script check --timeout=0 and no errors were reported
• The new code is covered by unit tests (check build/coverage for coverage report)
• I have updated the documentation to describe the changes

[coveralls]

Coverage remained the same at 94.633% when pulling 6087305 on JuzSer:dev-master into 733f845 on PHPOffice:develop.