SlidePublishTask - handle ShowSlide and IsPublished() across versions

[jsirish]

The SlidePublishTask was built to migrate from the original ShowSlide boolean to a versioned draft/live record. Now that ShowSlide has been dropped as a $db static, the task no longer works in recent versions.

We'll need to adjust the task across major versions to handle data migration from version 1 to 2, 2 to 3, and 3 to 4.

This may require a database query to see if the records contain the ShowSlide column in the version after this was depreciated.

[muskie9]

After discussion we'll focus on the following:

• Remove the publish task from the 4 branch
• Revisit the publish task in the 3 branch to ensure it is working as expected
• Anything v2 or before would be done on a project to project basis and not covered anymore by the module support