Simple FileSystem GUI.
Basic File System Window integration.

Show, Hide, ReadData...
FileSys: browing local filesystem
FileSys: resizable window
FileSys: browsing remote filesystem.
Don't confirm Quit when 0 MH classes are active.
FileSys: report error when cannot open folder.
FileSys: deleting files and folders
FileSys: sending files to client
FileSys: getting file attributes (times only)
FileSys: copying files from client to server
FileSys: warning when overwiting file
Merge branch 'filesystem'