Dnd (#103)

* wip: drag offers

* wip: dnd

* wip: dnd

* feat: hover indicators

* feat: change directory on hover

* fix: dnd drop filtering and drop kind

* fix: mouse area selection rectangle

* fix: better drag rectangle and dnd drag interaction

* feat: nav and tab dnd

* cleanup: remove extra patch

* cleanup: delete leftover dnd widgets

* chore: update libcosmic

* fix: list view spacer height overflow

src/clipboard.rs

@@ -16,6 +16,7 @@ pub enum ClipboardKind {
     Cut,
 }
 
+#[derive(Clone, Debug)]
 pub struct ClipboardCopy {
     pub available: Cow<'static, [String]>,
     pub text_plain: Cow<'static, [u8]>,