Config type field cleanup and refactor: moving out of Plugins.pm and to its own ConfigType.pm.
Major update to the Entry or Page, Entry, and Page config types.

* All three field types now operate off of the same codebase.
* Added the ability to select multiple objects.
* Added the ability to sort selected objects by drag-drop.
* Added the ability to store an object unpublished with the "inactive area."
Bump to version 2.3.0.
Hide the actual field values, and bump to 2.3.1.

It never fails that I forget to do something stupid after a big release!
Added the sortable image.
Added the jQuery UI for sorting.
Version bump to 2.3.2 to catch the things I missed before.
Fixed a bug where single-use Page, Entry, and Entry or Page field types would forget inactive objects.
Version bump to 2.3.3.
Fix some warnings in the Entry/Page config type tag handler. Bump to version 2.3.4.
The revised Entry and Page field types should return simply the active object IDs if the function tag is called.
Bump to version 2.3.5
Fixed warning for the Selected object fields when no some values don't exist.
Fixed a bug in the JS for the `entry`/`page` field types where just-inserted items could not be deleted. Bumped to version 2.3.6.
Added support for the `republish` key to republish archive templates, in addition to index templates. Bumped to version 2.3.7.
A field's value should always return *something*, so fall back to an empty string (''). This fixes a variety of warnings. Bumped to version 2.3.8.
Bump to version 2.3.9. Cleanup of 9c901eb6d and proper checking of initialized or true values.
Check if any entry IDs have been found before trying to work with them. Bump to version 2.3.9.
Sometimes the plugin object ends up in the Theme Options and throws an error to the Activity Log. Just skip over it to avoid the log message.
Version bump to 2.3.10.