Fixed missing space before /launchdebugger command.
Fixed Build/Rebuild menu items to not be drop downs.
Unified tree view to use a single context menu for both folders and items.
Fixed item rebuild to work on multiple selection.
Added "Debug Mode" checkbox to enable content pipeline debugging.
Made multiselect properties non-browsable by the designer.
Removed setting of selected nodes.
This hides the selection properties from the designer serialization process.
Fixed up deletion of items to remove empty folders.
We can no longer remove the root item.
Fixed "Add Item" to correctly open the folder location.
Added the handler back for the "Add Item..." tree context menu.
Merge pull request #2674 from SickheadGames/pipeline7

Pipeline Tool Improvements