Updates for dmd 2.066.
Some fix for debug.
Do not support Win9x.
FIX: Improper custom draw events handling

This fix is for a bug that DFL64 program crashes if using treeview
contains icon images.
To fix this, rewrite the whole event handling flow of NM_CUSTOMDRAW.
Note: Most important thing, the system allows only actions corresponding
to each Draw Stage.