Moved some 'common' WPF components into one folder
Added Extension property to TargetFile
Returning Source file next to Data buffer
Improved Target Navigator UI

It can now dynamically distinguish between
string/image/process/folder/binary content and choose preview respectively.
Listing folder returns folders first now
Added stub '..' to go up inside the folders-tree
Added Target Navigator items listing on selection
Added basic folder navigation, when double-clicked
Implemented full target navigation support