new features and optimize

1. new feature: move folder by select in folder selector dialog,
only context menu currenly, should add DND support later.

2. new feature: add context menu of moving documents by select
in folder selector dialog

3. disable copy document currently, not complete

4. optimize document drag badget, draw icon with draging-count

5. move CWizScrollBar to independent widget under src/widgets/ directory

6. add CWizFolderView to select folder when move and copy documents

7. complete CWizFolderSelector to show folder selection dialog
when copy and move

8. add CWizDocumentSelectionView to show selection animation when
user selection multi-document, not complete currently.