Initial support for PGP decryption & signatures

lib/ui/interfaces.go

@@ -16,6 +16,10 @@ type Drawable interface {
 	Invalidate()
 }
 
+type RootDrawable interface {
+	Initialize(ui *UI)
+}
+
 type Interactive interface {
 	// Returns true if the event was handled by this component
 	Event(event tcell.Event) bool