Serge Ivanov and Andrew Lewycky. Fixed item focus behavior to match
Windows. Fixed item selection when un/expanding items. Implemented
WM_SETREDRAW. Added Corel's COMCTL32_CreateToolTip() helper function
to commctrl.c.
- implementation of TVM_SETINSERTMARK & TVM_SETINSERTMARKCOLOR
- fixed some typo's
- custom draw enhancements
- implementation of state images
- implementation of TVS_CHECKBOXES