io_replaceInFile: replace warning with logging call

use expectException instead of setExpectedException for PHPUnit

avoid dependency tests being marked as risky

I will be so glad when we stop supporting old PHP

actually we could right now. but I don't like to introduce that change in
a feature branch.

make use of exception wrapper in io test

Handle breaking class rename in PHPUnit 6.0

See for reference #1837 and sebastianbergmann/phpunit#2503

PHPUnit 6 now only supports namespaced classes

However those classes are already supported in PHP 5.7 so we can switch
to them without breaking backward-compatibility.

adjust tests to make use of new DOKU_HAS_*ZIP defines

Abort io_replaceInLine when the search parameter is empty

Minor Refactoring
- put test comments in more appropriate spot
- move appending replacement line alongside its search/delete code

add anchors when constructing pattern from a non-regex oldline

Refactor code to make it simpler.
The changes should also:
- fix unlikely edge case when replacement line is the same as the
old line (would have resulted in timeout)
- reduce memory footprint
- av

Refactor code to make it simpler.
The changes should also:
- fix unlikely edge case when replacement line is the same as the
old line (would have resulted in timeout)
- reduce memory footprint
- avoid applying string search beyond maxlines replacement limit

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Limit number of lines to replace.