Encryption and One-Way-Control (#200)

This is a major rewrite of the core networking logic enabling one-way control and encryption through the webrtc-dtls crate.

closes #164 
closes #104

lan-mouse-gtk/src/key_object.rs

@@ -0,0 +1,25 @@
+mod imp;
+
+use adw::subclass::prelude::*;
+use gtk::glib::{self, Object};
+
+glib::wrapper! {
+    pub struct KeyObject(ObjectSubclass<imp::KeyObject>);
+}
+
+impl KeyObject {
+    pub fn new(desc: String, fp: String) -> Self {
+        Object::builder()
+            .property("description", desc)
+            .property("fingerprint", fp)
+            .build()
+    }
+
+    pub fn get_description(&self) -> String {
+        self.imp().description.borrow().clone()
+    }
+
+    pub fn get_fingerprint(&self) -> String {
+        self.imp().fingerprint.borrow().clone()
+    }
+}