Pull Request for Issue #13507 .

Summary of Changes

SQL Server database always escape backslash in result.
This PR stripslashes for each column from result query.

Testing Instructions

TEST 1

Before patch

1. Go to article, change some text or nothing, save article a few times.
2. Go to "Versions" (button at the top), there should open a modal window with list of dates and versions.
3. Click on some date row which open popup window.
4. You should see warnings and no data information about changes between versions.

Warning: Invalid argument supplied for foreach() in .../administrator/components/com_contenthistory/helpers/contenthistory.php on line 32

Warning: Invalid argument supplied for foreach() in .../administrator/components/com_contenthistory/helpers/contenthistory.php on line 295

After patch the warning does not appears and you see some information.

TEST 2

Before patch

1. Edit new article, and write two chars in full text: \"
2. Re-save a few times without changing anything more.
3. You should see more and more backslashes, ignore html tags in ex. \\", next \\\\", etc.

After patch the number of backslashes are not increased on each save.

TEST 3

Before patch:

1. Edit article and add to Link A Text (Images and Links Tab): A""B.
2. After you save article you get Error decoding JSON data: Syntax error.

After patch

1. Do the same and save and load article works as expected.

Documentation Changes Required

N/A