* Find PlacementModes by attribute
* Let modes specify priority
* Make some PlacementManager dependencies public so Content can use them
* Space out the priorities a bit more
* xmldoc for attribute
* Revert "xmldoc for attribute"
This reverts commit f1f0299c55.
* Revert "Space out the priorities a bit more"
This reverts commit 549eac1eb2.
* Revert "Make some PlacementManager dependencies public so Content can use them"
This reverts commit c060f6cb2d.
* Revert "Let modes specify priority"
This reverts commit f113b40c7f.
* Revert "Find PlacementModes by attribute"
This reverts commit 27efb6c5cf.
* Completely redo to use PlacementManager's mode dictionary
* Backwards compat
* Cache the value of AllModeNames
9ea51432d1