Update Creators-Kit to v1.5.4

- FolderTree, CreatorTreeModel, CreatorTreeTransferHandler refactored to ManagerTree, ManagerTreeModel, and ManagerTreeTransferHandler, respectively
- ManagerTree now uses Characters directly as nodes instead of ObjectPanels, and new Folder class for folder nodes
- TimeTree added which links the ManagerTree to the Timesheet
- Switch buttons removed in favour of managing Objects via Tree Drag/Drop
- Help button added to CreatorPanel to link to youtube tutorial
- Setup saving/loading updated to handle new ManagerTree

WIP
- TimeSheetPanel tab added to Toolkit. WIP, temporarily hidden
- Various UI elements worked on to support TimeSheetPanel
- TimeTree correlates of ManagerTree created for TimeSheetPanel

plugins/creators-kit

@@ -1,2 +1,2 @@
 repository=https://github.com/ScreteMonge/creators-kit.git
-commit=809c6b6dc3173ec60feb09719d4b8d742780b14d
+commit=2450fefbaa8fa59af946e2ade0291a170db83681