Folderman: Fix path detection in folderForPath().
SocketAPI: Create the socket API instance in folderman.
PropagatorQNAM: Never send if-match header for new files.
SocketAPI: rename slot to send UPDATE_VIEW.
SocketAPI: Send an UPDATE_VIEW to the shell plugin on connect.

For each configured sync folder send an UPDATE_VIEW directly after
the socket connect to make the shell integration updating the view.