Support PDO

[PerfectSlayer]

Hi @hrk

Due to the migration to PDO, the plug-in raise an error: Legacy connection.
I saw on the community forum you plan to port you add-on. Could you confirm this add-on will be maintained?
Do you need help for the port ? I also saw one commit to address the issue: schmidi@81242ba (I haven't tested it).

Thanks!

[hrk]

Sorry for the late reply. I incorporated @schmidi's changes in a new 6ab5b92 as I couldn't understand how to merge a fork. The code is now ready and has been tested to work.

[hrk]

Note: for people running an old instance there is a separate branch called pre-pdo. This seemed easier to me than managing two APIs at the same time.

[schmidi]

@hrk Thanks for including my changes. The plugin works and gives no warnings with the new PDO class, nevertheless I suggest to refactor the queries as prepare methods are not correctly used.