add keybind to sort table

lots of refactoring to do so
files on disk, and files in trash interface'd so table is agnostic
model keeps track of the files now, to facilitate sorting, and updates its own rows accordingly

internal/tables/modes/modes.go

@@ -0,0 +1,28 @@
+package modes
+
+type Mode int
+
+const (
+	Trashing Mode = iota + 1
+	Listing
+	Restoring
+	Cleaning
+	Interactive
+)
+
+func (m Mode) String() string {
+	switch m {
+	case Trashing:
+		return "Trashing"
+	case Listing:
+		return "Listing"
+	case Restoring:
+		return "Restoring"
+	case Cleaning:
+		return "Cleaning"
+	case Interactive:
+		return "Interactive"
+	default:
+		return "0"
+	}
+}