Wraps image paths in RelativePath
Removes popup from error dialog
Moves constant to sole client
Moves Perspective implementation in Swing to separate module
Inlines interface
Merges Lib_Gui and Lib_Workflow into Platform_Swing
* Moves lots of classes from Platform there
* Even if they only marginally depend on Swing
* Let's cure them from cancer!
Frees TreeFramework from Platform_Swing
Merges Lib into Platform
Fixes dependencies and tests