- bug fixed: will not crashed after the multiple times of closing the FormTagManager.

- cancel the not needed message queue while new form created.
- TBD: however, the hot-key ESC and ENTER does not work now due to this canceling.
start to make ShellFolder
Tags are listed in ShellFolder
Tags are listed in the tree on the left side.
initialized the message queue for the list-view in the ShellFolder