Cleanup|libgui: Replaced debug printouts with log entries
Fixed|Client|SettingsRegister: Finishing up a file write
Documentation|libdeng2: Updated File and Folder API docs
Documentation|libdeng2: API doc note about File flushing
libshell|LocalServer: Asking for the error log path
Shell|GUI: Show local server error log if it fails to start
Merge remote-tracking branch 'remotes/origin/master' into savegame-refactor