Whiteboard PR40: renaming Sling Model Persist

[Brendan Robert <br...@adobe.com.INVALID>]

Is anyone willing to review and approve the naming change for the Sling Model Persist service bundle?   The original name was JCR Persist, but it was aptly noted that the code actually only uses Sling and not JCR calls.

https://github.com/apache/sling-whiteboard/pull/40

I am happy to revise if any additional changes are needed, but for now the naming and minor JDK 11 fix is the only subject of this PR.   Also, would anyone care to collaborate on the future of this feature as part of the Sling Model feature?  In addition to transparent persistence, it also adds Sling Model support for more advanced collection types such as maps and enumeration maps.

Thank you for your consideration,
-Brendan Robert