Silverstripe 5 compatibility

Support for Silverstripe 5, including the following info from #23

Many thanks to @satrun77 and @michalkleiner

• ground work done by @satrun77 in #21 👏
• incorporates #18 to hide the scans from the 'Used on' table
• replaces inlined 3rd-party lib with a composer module xenolope/quahog that also works * with newer versions of ClamAV
• took inspiration from #19 to use file string streams (not file streams)
• drops support for https://github.com/symbiote/silverstripe-cdncontent

3.0.1

Merge pull request #17 from open-sausages/pulls/message-sanitisation

BUG Message sanitisiation

3.0.0

Module upgraded for SS4, see work on PR #13

2.0.2

Merge pull request #14 from dnadesign/master

PHP 7.2+ compatibility

2.0.1

Fixes:

• ca2ffbd: Scans default to the original scan's IPAddress (rather than 127.0.0.1). This will make tracking down a resources src ip easier.

2.0.0

[FIX] The composer require example now matches the version.